Polycarboxylate water reducer solid raw material pre-dissolving kettle

The utility model belongs to the technical field of water reducing agent raw material pre-melting, and particularly discloses a polycarboxylic acid water reducing agent solid raw material pre-melting kettle which comprises a pre-melting kettle body, a discharging valve is connected to the bottom of the pre-melting kettle body, a mounting frame is fixedly connected to the bottom of the discharging valve, and a filter box is arranged at the bottom of the mounting frame. A filter screen is arranged in the filter box, a plurality of inserting plates are fixedly connected to the top of the filter box, inserting holes are formed in the positions, close to the middle, of part of the inserting plates, fixing plates are symmetrically arranged on the positions, close to the middle, of the two sides of the mounting frame, and the fixing plates are inserted into one side of the mounting frame and penetrate through the inserting holes formed in the inserting plates to fix the filter box in a crossed mode; fixing grooves a