The invention discloses a motor-driven pressure test pump device for complex pipe welding line examination. The motor-driven pressure test pump comprises a motor-driven pressure test pump, a left end of a four-way connection joint is communicated with the motor-driven pressure test pump through a first pipe with a first valve, a right end of the four-way connection joint is communicated with a buried pipe to be detected through a third pipe, the upper end of the four-way connection joint is provided with a pressure gage and the lower end of the four-way connection joint is communicated with a pressure water source through a second pipe with a second valve. The motor-driven pressure test pump device for complex pipe welding line examination ensures pipe welding line examination quality, has a simple principle, can be fast and simply operated, guarantees quality, reduces a resource investment and reduces on-site work difficulty.