Tunnel excavation unloading surrounding rock water seepage test device

The embodiment of the invention provides a tunnel excavation unloading surrounding rock water seepage test device, and relates to the technical field of surrounding rock water seepage test devices. The tunnel excavation unloading surrounding rock water seepage test device comprises a device supporting mechanism, an outer wall pressurization test mechanism and a water seepage pressurization test mechanism. The device supporting mechanism comprises a base and a supporting frame, the supporting frame is installed at the top of the base, an arc-shaped groove is formed in the top of the base, the outer wall pressurization test mechanism comprises a rock test piece, an outer sleeve, an end cover, a hydraulic cylinder and a pressing plate, the outer sleeve is arranged in the arc-shaped groove, and the end cover is arranged on the outer sleeve. And the rock test piece is inserted into the outer sleeve. A water injection cavity is formed between the rock test piece and the outer sleeve. The booster pump pumps a water