A suction cleaner for a pool, comprising a housing which is provided with a water inlet in the middle position of the bottom, and further comprising: a hydraulic motor used for providing power for the cleaner; travelling mechanisms used for travelling; a reversing mechanism used for changing a travelling direction; a joint mechanism used for connecting an external water outlet pipe, wherein the hydraulic motor and the reversing mechanism are arranged in the housing; the hydraulic motor is arranged in the middle position in the housing and is communicated with the water inlet; the travelling mechanisms are symmetrically arranged on the left side and the right side of the housing; the joint mechanism is arranged in the middle position on the top of the housing and is in communication with the hydraulic motor; one end of a motor output shaft of the hydraulic motor is provided with a first gear and the other end is provided with a second gear; the first gear is engaged with a first transmission mechanism; the first transmission mechanism is respectively engaged with a third transmission mechanism and a fourth transmission mechanism; the third transmission mechanism and the fourth transmission mechanism are respectively engaged with the travelling mechanisms on the left side and the right side of the housing; the second gear is engaged with the reversing mechanism through the second transmission mechanism; the reversing mechanism is connected with the first transmission mechanism; and the water inlet, the hydraulic motor and the rotating swing joint mechanism form a water circulation passage for a water stream to pass through, characterized in that the joint mechanism is a rotating swing joint mechanism capable of swinging and rotating back and forth relative to the housing, and in that a plurality of rolling skirt wings are symmetrically arranged at the bottom of the housing; the rolling skirt wings being rotatably connected with the housing; and the rolling skirt wings being used to increase suction around the water inlet at the bottom of the housing. a hydraulic motor used for providing power for the cleaner; travelling mechanisms used for travelling; a reversing mechanism used for changing a travelling direction; a joint mechanism used for connecting an external water outlet pipe, wherein the hydraulic motor and the reversing mechanism are arranged in the housing; the hydraulic motor is arranged in the middle position in the housing and is communicated with the water inlet; the travelling mechanisms are symmetrically arranged on the left side and the right side of the housing; the joint mechanism is arranged in the middle position on the top of the housing and is in communication with the hydraulic motor; one end of a motor output shaft of the hydraulic motor is provided with a first gear and the other end is provided with a second gear; the first gear is engaged with a first transmission mechanism; the first transmission mechanism is respectively engaged with a third transmission mechanism and a fourth transmission mechanism; the third transmission mechanism and the fourth transmission mechanism are respectively engaged with the travelling mechanisms on the left side and the right side of the housing; the second gear is engaged with the reversing mechanism through the second transmission mechanism; the reversing mechanism is connected with the first transmission mechanism; and the water inlet, the hydraulic motor and the rotating swing joint mechanism form a water circulation passage for a water stream to pass through, characterized in that the joint mechanism is a rotating swing joint mechanism capable of swinging and rotating back and forth relative to the housing, and in that a plurality of rolling skirt wings are symmetrically arranged at the bottom of the housing; the rolling skirt wings being rotatably connected with the housing; and the rolling skirt wings being used to increase suction around the water inlet at the bottom of the housing.