The invention discloses a potassium chlorate drying device comprising a drying box. The right side of the top of the drying box is movably connected with a feeding pipe. The bottom of the drying box is movably connected with a discharging pipe. The top of the drying box is movably connected with a motor. The bottom of a rotating shaft penetrates through the drying box and extends to an inner cavity of the drying box. Through matching of the drying box, the feeding pipe, the discharging pipe, the motor, the rotating shaft, stirring blades, a heating box, heating bases, a heating pipe, an electric heating wire, heat conducting sheets, a bottom plate, a connecting plate, a supporting plate, a hot air blower, a power frequency modulator, a hot air guide pipe, a vacuum pipe, an exhaust pipe, atemperature sensor, a humidity sensor, a control panel and a single chip microcomputer, the problems that a traditional potassium chlorate drying device is slow in drying process and does not have a smashing function, potassium chlorate needs to be smashed through a smashing machine after being dried, and consequently production cost is increased for enterprises are solved.