The invention discloses a coagulating stirring device for phosphate aluminum magnesium chloride. The coagulating stirring device comprises a stirring box, wherein the inner wall at the top end of thestirring box is welded with a rotary motor; the output end of the rotary motor is connected with a rotary shaft; one end, away from the rotary motor, of the rotary shaft is fixedly equipped with a connecting plate through a bolt; the two sides of the connecting plate are connected with stirring plates which are symmetrically arranged through bolts; a sleeve is arranged on the outer wall of each stirring plate; each sleeve is in sliding connection with the corresponding stirring plate; grooves are symmetrically formed in the two sides of the connecting plate; first telescopic poles are arrangedinside the grooves; the other ends of the first telescopic poles are connected with the side walls of the sleeves; one side, away from each first telescopic pole, of each sleeve is symmetrically equipped with slide rails; slide plates are in sliding connection on the slide rails; and the bottom ends of the slide plates are fixedly equipped with spading plates through bolts. After stirring phosphate aluminum magnesium chloride, the coagulating stirring device can automatically clear residual phosphate aluminum magnesium chloride on the stirring plates, so that resources are saved, and clearingis complete; and moreover, clear efficiency is high, labor intensity of a worker is reduced, and the stirring effect is greatly improved.