Abstract: In order to improve the detection efficiency of automobile accumulator, according to the structural characteristics of vacuum electron beam weld of accumulator, a set of fully automatic automobile accumulator weld detection equipment was designed. The weld seam of the accumulator was detected by the inverted clamping accumulator rotating, the probe being fixed and the fan scanning. The design of the multi-degree-of-freedom probe fixture with open guide sleeve structure could quickly and stably match the scanning parts of different types of automobile accumulators, with high detection accuracy, and the core components did not need to be soaked in water, so the reliability was good; This equipment realized fully automatic loading and unloading, fully automatic detection and fully automatic sorting of different types and models of automobile accumulators, without manual operation and high detection efficiency. Through the verification of the measurement systems analysis in actual production operation, it showed that the equipment could quickly, efficiently and stably realize automatic ultrasonic imaging detection of different kinds and models of automobile accumulator welds such as bellows, diaphragm and piston, and could 100% identify the state of the detected sample.