The invention discloses an ultrasonic detection device used for automobile maintenance. The ultrasonic detection device used for automobile maintenance comprises a groove steel plate, a plurality of pressure measuring devices, a telescopic rod, an operation screen, a groove, a motor, an ultrasonic detector, an anti-interference protective casing, a plurality of gears, a gear belt, a skidproof stripe belt, a limiting block, a backing plate, a supporting plate, a bidirectional hydraulic device, a balance hydraulic device and a balance hydraulic rod, wherein the pressure measuring devices are mounted at four corners of the bottom of the groove steel plate respectively; each pressure measuring device comprises a supporting base, a pressure tester, a support pillar and a rubber base, each pressure tester is mounted at the bottom of the corresponding supporting base, and each support pillar is mounted at the bottom of the corresponding pressure tester. The device is scientific and reasonablein structure and safe and convenient to use, the gears are driven by the motor, the ultrasonic detector can be driven to move freely through mutual rotation of the gears and the gear belt, and the ultrasonic detector or an automobile does not need to move manually any more during automobile maintenance, so that the maintenance speed is improved, and the manpower and material resources are saved.