The invention discloses a detection method of the handheld terminal for detecting automatic welding equipment. The handheld terminal is provided with a data analysis and diagnosis module and a data collection module, wherein the data analysis and diagnosis module comprises a processing chip and a field-programmable gate array, the data collection module is provided with an analog-to-digital conversion circuit, the analog-to-digital circuit is respectively connected with an automatic welding equipment controller, a current clamp, a mutual inductor and a camera through signal lines, the handheld terminal is provided with a remote monitoring module, a storage module, and a communication module and a display module. The method adopting the terminal for detecting the welding equipment comprises the steps including terminal self inspection, equipment connection, parameter setting, signal processing, result display, remote detection, system upgrading and the like. The terminal has the characteristics that the size is small, the functions are rich, and the response speed is high. The detection method can be used for fast and precisely detecting the power supply quality of the automatic welding equipment and the operation quality in the welding process.