The invention discloses an obliquely placed photovoltaic panel water induction swinging composite cleaning device. The structure of the device comprises a chassis, a workbench, a control panel, a transmission lead, a sliding composite cleaning mechanism, a photovoltaic panel and a matching groove, wherein the chassis is welded to the lower end of the workbench; the control panel is fixed to the right end of the upper surface of the chassis through screws; and the control panel is electrically connected with the right end of the sliding composite cleaning mechanism through the transmission lead. Through the arrangement of the sliding composite cleaning mechanism, a drive motor and an auxiliary sliding frame are matched with each other, a buckle frame can move up and down stably, the shakingis reduced, the buckle frame is prevented from falling down, a water induction swinging mechanism and a detachable composite cleaning mechanism are matched with each other, dust on the photovoltaic panel is cleaned in a double composite mode, the cleaning degree is improved, the initial speed of sprayed water columns is higher through the rotation of a spray head, the flushing efficiency of the equipment is quickened through the water column, all liquid outlets are formed in the lower end of the spray head, all the water columns are sprayed onto the photovoltaic panel in a coverage mode, andthe utilization rate of water is improved.