A stereotactic surgery robot comprising: a rotating unit configured to have a surgical instrument that is able to be attached thereto, and configured to rotate the surgical instrument on a first rotational axis perpendicular to an operating table while being connected to the operating table and a second rotational axis perpendicular to the first rotational axis according to an entry posture of the surgical instrument; and a moving unit configured to move the rotating unit in a direction of three linear axes (13, 15, 17) according to a position of a surgical target included in a surgical portion in which the surgical instrument enters, wherein the moving unit is configured to move the rotating unit such that an intersection point of the first and the second rotational axes (43, 45) matches the surgical target, wherein the stereotactic surgery robot further comprises: a surgical portion support unit configured to be connected to a first direction driving unit of the moving unit, configured to be detachably connected to the operating table, and comprising a connecting unit that is detachably connected to the moving unit; and a surgical portion fixing unit directly fixed to the surgical portion support unit and configured to fix the surgical portion to prevent the movement of the surgical portion, the moving unit comprises: the first direction driving unit configured to move along a first linear axial direction; a second direction driving unit configured to move along a second linear axial direction while being connected to the first direction driving unit; and a third direction driving unit configured to move along a third linear axial direction while being connected to the second direction driving unit, and the rotating unit comprises: a first rotational driving unit configured to rotate on the first rotational axis while one end of the first rotational driving unit is connected to the third direction driving unit; and a second rotational driving unit configured to rotate on the second rotational axis while one end of the second rotational driving unit is connected to the other end of the first rotational driving unit. a rotating unit configured to have a surgical instrument that is able to be attached thereto, and configured to rotate the surgical instrument on a first rotational axis perpendicular to an operating table while being connected to the operating table and a second rotational axis perpendicular to the first rotational axis according to an entry posture of the surgical instrument; and a moving unit configured to move the rotating unit in a direction of three linear axes (13, 15, 17) according to a position of a surgical target included in a surgical portion in which the surgical instrument enters, wherein the moving unit is configured to move the rotating unit such that an intersection point of the first and the second rotational axes (43, 45) matches the surgical target, wherein the stereotactic surgery robot further comprises: a surgical portion support unit configured to be connected to a first direction driving unit of the moving unit, configured to be detachably connected to the operating table, and comprising a connecting unit that is detachably connected to the moving unit; and a surgical portion fixing unit directly fixed to the surgical portion support unit and configured to fix the surgical portion to prevent the movement of the surgical portion, a surgical portion support unit configured to be connected to a first direction driving unit of the moving unit, configured to be detachably connected to the operating table, and comprising a connecting unit that is detachably connected to the moving unit; and a surgical portion fixing unit directly fixed to the surgical portion support unit and configured to fix the surgical portion to prevent the movement of the surgical portion, the moving unit comprises: the first direction driving unit configured to move along a first linear axial direction; a second direction driving unit configured to move along a second linear axial direction while being connected to the first direction driving unit; and a third direction driving unit configured to move along a third linear axial direction while being connected to the second direction driving unit, and the first direction driving unit configured to move along a first linear axial direction; a second direction driving unit configured to move along a second linear axial direction while being connected to the first direction driving unit; and a third direction driving unit configured to move along a third linear axial direction while being connected to the second direction driving unit, and the rotating unit comprises: a first rotational driving unit configured to rotate on the first rotational axis while one end of the first rotational driving unit is connected to the third direction driving unit; and a second rotational driving unit configured to rotate on the second rotational axis while one end of the second rotational driving unit is connected to the other end of the first rotational driving unit. a first rotational driving unit configured to rotate on the first rotational axis while one end of the first rotational driving unit is connected to the third direction driving unit; and a second rotational driving unit configured to rotate on the second rotational axis while one end of the second rotational driving unit is connected to the other end of the first rotational driving unit.