Pipe hydrostatic testing machine is composed of computer and PLC upper and lower control system. The upper computer mainly completes the graphic processing, data processing and data management. The lower computer controls the pressure system to achieve the target pressure according to the instructions of the upper computer and the pressure rate. The test process is controlled by microcomputer. The pressure value, test time and test state are displayed in real time. The data processing and analysis are carried out by microcomputer. The test results can be saved automatically, and the report can be exported and printed.