High-flux silicon nitride powder preparation device

The utility model discloses a high-flux silicon nitride powder preparation device which comprises a reaction box body and a box cover movably connected with the reaction box body, supporting legs are fixedly arranged below the reaction box body, an air inlet assembly and an air cylinder are arranged on the outer wall of one side of the reaction box body, an exhaust assembly and a discharging port are arranged on the outer wall of the other side of the reaction box body, and a uniform scraping and cleaning assembly is arranged at the lower end in the reaction box body. The uniform scraping and cleaning assembly comprises a lifting push plate, a rake plate, a pneumatic telescopic rod A and a pneumatic telescopic rod B. An air duct is arranged at the top in the reaction box body, an opening is formed in the air duct, an air swinging assembly is installed in the opening, a heater is installed on the inner side face of the reaction box body, and a feeding hopper is arranged on the box cover. And an air conveying p