An orthopedic surgery system, comprising a control device, a navigation device, a robotic arm and an osteotomy guide, the osteotomy guide attached to one end of the robotic arm, the robotic arm configured to adjust the position and orientation of the osteotomy guide, the navigation device comprising a tracker and a guide fiducial marker, the guide fiducial marker attached to the osteotomy guide or the robotic arm, the tracker configured to track the current position of the guide fiducial marker and generate information about the current position, the position of the guide fiducial marker configured to characterize the position of the osteotomy guide, the control device configured to control the robotic arm to move based both on the information about the current position of the guide fiducial marker fed back from the tracker and on information about a desired position for the guide fiducial marker, thereby driving the osteotomy guide and the guide fiducial marker to move so that the guide fiducial marker reaches the desired position, characterized in that: the orthopedic surgery system further comprises a checking device configured to check whether the osteotomy guide and/or the guide fiducial marker has/have undergone deformation, wherein: the osteotomy guide comprises an osteotomy guide block (40, 41, 42, 43, 20, 21, 22, 23, 24) provided thereon with a plurality of guide features for providing osteotomy guidance, and the checking device comprises at least one checking fiducial marker configured for detachable attachment to the osteotomy guide block (40, 41, 42, 43, 20, 21, 22, 23, 24); the tracker is configured to record initial positional information of the checking fiducial marker relative to the guide fiducial marker before delivery from the factory and record information about the current position of the checking fiducial marker relative to the guide fiducial marker after each surgical use; and the control device is configured to determine whether there is a match between the initial positional information of the checking fiducial marker and the information about the current position of the checking fiducial marker, if there is a match, determine that the osteotomy guide and/or the guide fiducial marker has/have not undergone deformation, and if there is not a match, determine that the osteotomy guide and/or the guide fiducial marker has/have undergone deformation. the navigation device comprising a tracker and a guide fiducial marker, the guide fiducial marker attached to the osteotomy guide or the robotic arm, the tracker configured to track the current position of the guide fiducial marker and generate information about the current position, the position of the guide fiducial marker configured to characterize the position of the osteotomy guide, the control device configured to control the robotic arm to move based both on the information about the current position of the guide fiducial marker fed back from the tracker and on information about a desired position for the guide fiducial marker, thereby driving the osteotomy guide and the guide fiducial marker to move so that the guide fiducial marker reaches the desired position, characterized in that: the orthopedic surgery system further comprises a checking device configured to check whether the osteotomy guide and/or the guide fiducial marker has/have undergone deformation, wherein: the osteotomy guide comprises an osteotomy guide block (40, 41, 42, 43, 20, 21, 22, 23, 24) provided thereon with a plurality of guide features for providing osteotomy guidance, and the checking device comprises at least one checking fiducial marker configured for detachable attachment to the osteotomy guide block (40, 41, 42, 43, 20, 21, 22, 23, 24); the tracker is configured to record initial positional information of the checking fiducial marker relative to the guide fiducial marker before delivery from the factory and record information about the current position of the checking fiducial marker relative to the guide fiducial marker after each surgical use; and the control device is configured to determine whether there is a match between the initial positional information of the checking fiducial marker and the information about the current position of the checking fiducial marker, if there is a match, determine that the osteotomy guide and/or the guide fiducial marker has/have not undergone deformation, and if there is not a match, determine that the osteotomy guide and/or the guide fiducial marker has/have undergone deformation. the osteotomy guide comprises an osteotomy guide block (40, 41, 42, 43, 20, 21, 22, 23, 24) provided thereon with a plurality of guide features for providing osteotomy guidance, and the checking device comprises at least one checking fiducial marker configured for detachable attachment to the osteotomy guide block (40, 41, 42, 43, 20, 21, 22, 23, 24); the tracker is configured to record initial positional information of the checking fiducial marker relative to the guide fiducial marker before delivery from the factory and record information about the current position of the checking fiducial marker relative to the guide fiducial marker after each surgical use; and the control device is configured to determine whether there is a match between the initial positional information of the checking fiducial marker and the information about the current position of the checking fiducial marker, if there is a match, determine that the osteotomy guide and/or the guide fiducial marker has/have not undergone deformation, and if there is not a match, determine that the osteotomy guide and/or the guide fiducial marker has/have undergone deformation.