The utility model relates to a stationary state pressure test device of a double mechanical seal. The stationary state pressure test device is composed of a mechanical seal pressure test member, a pressure test pump and a high-pressure pipeline. The mechanical seal pressure test member is a flange connection pipe nipple. Movable joints are installed at both ends of the high-pressure pipeline, wherein one end of the high-pressure pipeline is connected with the pressure test pump while the other end of the high-pressure pipeline is connected with the mechanical seal. With the use of the stationary state pressure test device, by using a method of pressurization by the pressure test pump, the change of pressure can be directly observed and whether leakage exists in the mechanical seal is judged; the pressure test of internal assemblies can be performed without disassembling the mechanical seal; and the hidden danger of leakage in the mechanical seal caused by secondary disassembly is avoided. Since the mechanical seal pressure test member is simple to manufacture and install and can be adjusted and machined according to different sizes of mechanical seals, the stationary state pressure test device has a wide application range.