A rock shearing-influent couple test system comprises a shearing box, a test force loading and displacement testing device, an open measurer and a computer, wherein the shearing box comprises a water inlet channel and a water outlet channel. The invention is characterized in also composed of an influent detector comprising a water inlet device and a water outlet flux measurer, the water inlet device is communicated with the water inlet of the water inlet channel, the water outlet flux measurer is communicated with the water outlet of the water outlet channel. When processes rock shearing-influent couple test, the invention can freely change the volume and change method of tangent force, normal force and water pressure, as well as obtain the open change, tangent displacement and flux, while the data can real represent the force state, without multiple devices, to reduce cost, save time, save following data treatment time, and improve working efficiency.