The invention discloses a starch pulping machine. The starch pulping machine comprises a pulping machine main body, wherein a base is fixedly arranged on the bottom of the pulping machine main body; support legs are arranged on the bottom of the base; the top of the pulping machine main body is provided with a first charging hole; the pulping machine main body consists of three parts: a smashing cavity, a stirring cavity and a grinding cylinder, smashing wheels are arranged inside the smashing cavity; one end of the smashing wheel is connected with an output shaft of the smashing motor througha rotary shaft; the bottom of the smashing cavity is provided with an oblique plate; one side of the oblique plate is provided with a third discharging hole; one side of the pulping machine main bodyis connected with a first support plate and a second support plate in a clamping manner; the second support plate is provided with a second motor; an output shaft of the second motor is connected with a stirring rod through a coupler. According to the starch pulping machine, a filtering screen is arranged in the stirring cavity, so smashed starch can be filtered in order to remove large impurities, so that a good grinding effect is achieved in the grinding cylinder.