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Aiming at the problem of measuring the model’s bottom pressure with low value and overheat threat of the pressure sensor, a special device was established in hypersonic wind tunnel to accurately measure the bottom pressure. The device uses small range absolute pressure film capacitor gauge as the main measuring element, and targeted design of sensor overload protection gas path, water cooling heat insulation structure and control program. The device is arranged on the model support mechanism of the wind tunnel test section, which can greatly shorten the pressure measuring gas path and reduce the switching link. The device was tested with HB-2 model at Mach number 5~9, the test results show that: The model’s bottom pressure precision measuring devices meet the design requirements, with high integration, low failure rate, the pressure stabilization time could be shortened significantly, and the device can response bottom pressure of the model change rapidly, can adapt to bottom pressure measurement requirement at high Mach number, the measurement precision is better than 0.5%, can greatly improve the accuracy of the model’s bottom pressure of the hypersonic wind tunnel.