Anti-blocking raw material premixing device

The utility model relates to the technical field of modification, research and development and mixing of novel polyphosphate flame retardants, and discloses an anti-blocking raw material premixing device which comprises a mixing device, a feeding port penetrates through the mixing device and is fixedly connected with the mixing device, and a discharging hopper is fixedly installed on the surface of the feeding port. By arranging a control assembly, an output shaft of a motor drives a disc to rotate in a fixing block, clamping teeth on the surface of the disc abut against a rack, the rack is stressed to slide in a sliding groove, a movable rod fixed to the surface of the rack moves under supporting of a spring, and a transverse rod fixed to the surface of the movable rod drives a supporting block to move; the baffle fixed to the surface of the supporting block slides in the feeding port and shields the feeding port, so that raw materials in the discharging hopper cannot enter the mixing device, and due to the