Pool cleaning device with self-cleaning function

The pool cleaning device with the self-cleaning function comprises a main body, a telescopic rod is arranged at the end of the main body, a rotatable brush head is arranged at the end of the telescopic rod, the brush head comprises a shell rotationally connected with the telescopic rod, the shell is provided with a containing cavity with an opening in one side, a cross rod is arranged in the containing cavity, bristles are arranged at the bottom of the cross rod, and the brush head is connected with the telescopic rod. A cleaning box is arranged at the position, located on the side portion of the transverse rod, in the containing cavity, the transverse rod is provided with an overturning mechanism and a moving mechanism, the overturning mechanism pushes the transverse rod to overturn upwards by 90 degrees, the moving mechanism drives the transverse rod to move towards the direction of the cleaning box, and bristles on the transverse rod are fed into the cleaning box; a spraying mechanism is arranged on the si