The invention relates to an anti-explosion air sac device. The air sac comprises an air sac body, and the upper part of the air sac body is provided with an air sac upper cover plate; an air pressure sensor and an air inlet joint are arranged on the air sac upper cover plate; a probe of the air pressure sensor is extended to the air sac body, and the lower part of the air sac body is connected with the air sac base through a lower air sac cushion block; the bottom face of the upper air sac cover plate is downwards provided with an upper air sac cushion block, an elastic device for connecting the upper and lower cushion blocks of the air sac are arranged between the upper and lower cushion blocks of the air sac; the air pressure sensor is connected with the input end of an ECU processor, and the output end of the ECU processor is connected with a low air pressure alarm. From above technical scheme, the upper air sac cover plate can slowly fall down under the effect of spring at the moment of the air sac blasting, and the vehicle body can slowly incline; at this moment, the air pressure sensor can feedback the signal to the ECU process, and the ECU controller feedbacks it to the low air pressure alarm, thus a driver can judge which air sac is blast according to the low air pressure alarm, so as to carry out emergency treatment on the whole vehicle, and avoid the traffic accident.