Water flow gravel separation device

The utility model discloses a water flow gravel separating device. The water flow gravel separation device comprises a volute, a water inlet pipe and a water outlet pipe, the water inlet is communicated with the inner cavity of the volute, and the direction of the water inlet deviates from the center of the volute; the overflow port is formed in the top of the volute, and the overflow port is communicated with an inner cavity of the volute; the baffles are distributed on the inner side of the volute, and included angles are formed between the baffles and the inner wall of the volute. The spiral case has the beneficial effects that the direction of the water inlet deviates from the center of the spiral case, so that water flow can rotationally flow in the spiral case and sequentially scour all the baffles, gravel can be promoted to be intercepted by the baffles, and the gravel can be deposited to the bottom of the spiral case; water flow can overflow out of the volute through the overflow port; an included ang