The invention discloses an automatic fire extinguishing device for a safe base station chassis. The fire extinguishing device comprises a frame, a front axle, a rear axle, dry powder fire extinguishing tanks and thermo-sensitive wires, wherein the rack comprises two longitudinal beams and a plurality of transverse beams which are welded; the front end of the frame is provided with the front axle and the rear end of the frame is provided with the rear axle; the two groups of dry powder fire extinguishing tanks are arranged on the transverse beams in front of the front axle and behind the rear axle of the frame; the thermo-sensitive wires are arranged on the longitudinal beams at the ends of the front axle and the rear axle of the frame and are used as a hot source detection probe; and one ends of the thermo-sensitive wires are connected with the dry powder fire extinguishing tanks; and the other ends of the thermo-sensitive wires are connected with a manual button in a car cab. Compared with the prior art, fire disasters caused by external kindling materials can be put out; the automatic fire extinguishing device can be used for automatically monitoring to extinguish fire or manually extinguishing fire and is particularly suitable for fire extinguishment of police cars; and the fire extinguishing device is simple in structure and is economical and practical.