Precast concrete spraying device

The utility model discloses a precast concrete spraying device which comprises an operation platform and a placement seat, a filter box is installed on the left side of the bottom end of the operation platform, the placement seat is arranged in the middle of the upper end of the operation platform, a supporting frame is installed on the edge of the upper end of the operation platform, and a water storage tank is fixedly placed in the middle of the outer top end of the supporting frame. A water conveying pipe is inserted into the inner bottom end of the placement seat outwards, a plurality of evenly-distributed dripping holes are dug in the inner bottom end of the placement groove, one end of an output pipe is connected with a filtering box, the other end of the filtering box is connected with one end of a backflow pipe, and multiple layers of filtering adsorption plates are arranged in the filtering box; the other end of the backflow pipe is connected with the water storage tank, and the whole pipeline on the