A measuring method for wall pressure of cabin with inner explosion is proposed in this paper. First of all, the pressure measuring environment of cabin with inner explosion is analyzed. When explosives explode inside the cabin, the long-lasting thermal shock and the large vibration acceleration of the bulkhead are generated.These will affect the wall pressure testing device and reduce measurement accuracy of the impulse of the bulkhead. Second, a heat-protection installation with heat-protection lipid is adopted to restrain the interference of thermal impact on the pressure sensor. It can withstand the thermal shock in the post-combustion stage and obtain the complete shock wave pressure change curve. Third, in order to suppress the vibration propagation from the wall to the pressure sensor, a vibration isolation mounting structure is designed, which is composed of a sensor, a mounting seat, a spacer ring, a base, and a pressure screw. At last, this paper study the effectiveness of the pressure measuring method via the theoretic analysis and the contrast experiment. The results show that the manner could effectively reduce the thermal shock effect in the duration of 500ms, suppress the influence of bulkhead vibration on the performance of the sensor, and improve the accuracy of wall pressure measuring of cabin with inner explosion. Therefore, the method presented in this paper is feasible for wall pressure measuring of the cabin with inner explosion.