The invention discloses a crushing and drying device for chemical fertilizer production. The crushing and drying device for chemical fertilizer production comprises a base A, a crushing tank and a base B, the upper end of the base A is connected with an air blower A, a dehumidifier A, a heater A and an air inlet pipe A, the upper end of the base B is connected with an air blower B, a dehumidifierB, a heater B and an air inlet pipe B, the upper part and the lower part of the right end of the air inlet pipe A are connected with an air pipe A and an air pipe B respectively, the upper part and the lower part of the left end of the air inlet pipe B are connected with an air pipe C and an air pipe D respectively, the other ends of the air pipe A, the air pipe B, the air pipe C and the air pipeD all extend into the crushing tank, the upper end of the crushing tank is connected with an air outlet pipe A, a motor A, a feeding hopper, a motor B and an air outlet pipe B, the output shaft of themotor A and the output shaft of the motor B are connected with a stirring shaft A and a stirring shaft B respectively, the output shaft of a motor C arranged in the middle of the left side of the crushing tank is connected with a stirring shaft C, a screen is arranged at the lower part in the crushing tank, and a discharging pipe is arranged at the lower end of the crushing tank. The crushing anddrying device has the advantages of being thorough in crushing, good in drying effect and high in screening and collecting efficiency.