Pressure test fixture

A pressure test fixture comprises a support, a first power cylinder, a connecting rod, a positioning rod, a positioning plate, an oil tank, a second power cylinder, a motorcycle cylinder to be detected and an air guide plate. The first power cylinder penetrates through the bracket and is slidably connected with the connecting rod, so that the first power cylinder drives the connecting rod to slidedownwards to press the air guide plate; the positioning rod is fixed with the positioning plate; a to-be-detected motorcycle cylinder is placed at the upper end of the positioning plate; an oil tankis arranged below the positioning plate; the bottom of the oil tank is fixed with second power cylinders; a second power cylinder body is fixed to the bottom of the support. When the device is used, the air guide plate is placed on the top of a motorcycle cylinder to be detected; the first power cylinder and the second power cylinder are started, and the oil in the oil tank submerges the motorcycle cylinder to be detected;