The invention discloses a catalyst dryer. The catalyst dryer comprises a tank body, a compression cylinder, an extension rod, a piston, a feed port, stirring blades, a stirring shaft, a heating jacket, a catalyst discharge port, a filter screen, a solvent discharge port, a frame, a stirring motor, a vacuumizing pipe and a filter; the tank body is arranged at the top of the frame; the compression cylinder is arranged at the top of the tank body, and is connected with the piston through the extension rod; the piston is connected with the inner wall of the tank body; the feed port is formed in one side of the tank body; the stirring motor is fixedly mounted on the frame; a power output shaft of the stirring motor is connected with the stirring shaft; the stirring blades are arranged on the stirring shaft; the filter is arranged on the right side of the tank body, and is connected with the vacuumizing pipe; the filter screen is arranged at the bottom of an inner cavity of the tank body; and the catalyst discharge port and the solvent discharge port are formed in the bottom of the filter screen. The catalyst dryer has the advantages of short treatment time and low energy consumption.