The invention discloses a grinding device for phosphate processing. The grinding device comprises a box body, a baffle, a filter net, a spring and a third grinding roller, a feed port is formed in thetop of the box body, the baffle is located below a first grinding roller, a screen is fixedly arranged at the bottom of the baffle, a grinding cylinder is arranged on the inner side of the box and isconnected to the baffle through the screen, the filter net is fixed in the box body, a micro vibration motor is connected to one end of the filter net, a discharge plate is fixedly arranged at the bottom of the inner side of the box body, the third grinding roller is located between the filter net and the discharge plate, and an air bellow is arranged on one side of the box body. According to thegrinding device for phosphate processing, three grinding rollers of different specifications are arranged from top to bottom, crystals are ground into powder through the baffle, the filter net and the discharge plate in the box body, and a fan and a resistive heater are arranged at the positions, on one side of the box body, in the air bellow, so that the ground crystals are aired and dried.