Self-absorption pre-spray coating device

The utility model relates to a self-absorption pre-spray coating device, which is characterized in that the bottom end of a hopper is fixed on a supporting seat on the bottom, the supporting seat is fixed on the ground through a tightening piece, a discharging port of the hopper is provided with a rotary discharging valve, a feeding end of the rotary discharging valve is connected with a discharging port of the hopper, a discharging end of the rotary discharging valve is connected with a pipe orifice, i.e. the pipe orifice I of a three-way pipeline through a flange, one pipe orifice, i.e. the pipe orifice II of the three-way pipeline is a free port, a steel wire screening net is arranged in the pipe orifice II, and another pipe orifice, i.e. the pipe orifice III of the three-way pipeline is connected with one pipe orifice, i.e. a feeding port of a double-port conveying pipeline through a flange; the other pipe orifice, i.e. the discharging port of the conveying pipeline is connected with an air inlet pipeline