Cable retracting device and photovoltaic cleaning system

The utility model relates to the field of photovoltaic technology, and provides a cable retracting device and a photovoltaic cleaning system.The cable retracting device comprises a shell and a recording device, the shell is provided with a containing space, a rotating shaft capable of automatically returning to the original position is installed on the shell, and at least part of the rotating shaft is arranged in the containing space; a plurality of circles of cables are wound on the rotating shaft located in the containing space in a preset winding mode, the length of each circle of cable is known, and a cable outlet corresponding to the containing space in position is formed in the shell; one end of the cable is fixed on the rotating shaft, and the other end extends out of the wire outlet and is connected to the cleaning robot; the recording device is installed on the rotating shaft and used for recording the number of rotating turns of the rotating shaft in the paying-off or taking-up process. The rotating