Hydraulic powder screening device

The utility model discloses a powder hydraulic screening device which comprises a double-cavity barrel body composed of an inner barrel and an outer barrel. A feeding pipe which is communicated with the inner cavity and is provided with a first control valve is arranged at the top end of the barrel body; a filter layer is arranged on the side wall of the inner barrel; the bottom end of the inner cavity is open, and a piston body capable of sliding up and down is arranged in the inner cavity; a discharge pipe is arranged at the lower part of the outer barrel; the piston body is provided with a vertically-through discharging hole. The lower end of the discharge hole is communicated with a corrugated hose, and the other end of the corrugated hose is communicated with a fixed pipe; and a second control valve is arranged on the fixed pipe. Coarse and fine particles are screened through hydraulic power, dust is prevented from being generated, long-time continuous work can be achieved, the screening effect is good,