Abstract: The present invention discloses cleaning apparatus and a PV module cleaning system. The cleaning apparatus includes a sweeper, a mobile terminal, a guiding rail and a control system. The mobile terminal is used for bearing the sweeper and walks along the guiding rail under the control of the control system, and the sweeper can move on the mobile terminal under the control of the control system; and the PV module cleaning system includes PV array panels, the PV array panels are m*n matrix, both m and n are positive integers, the guiding rail is located at one side of the PV array panels, the mobile terminal is located above the guiding rail, the sweeper is loaded on the bearing frame of the mobile terminal, and the sweeper reciprocates on the PV array panels through a walking mechanism.