Device for measuring opening change, flow velocity and flow pressure in joint closing-seepage test

The utility model discloses a device for measuring opening change, flow velocity and flow pressure in a joint closing-seepage test. The device comprises a fracture opening regulation and control mechanism and a seepage mechanism, the fracture opening degree regulation and control mechanism comprises an upper clamp and a lower clamp which are longitudinally arranged, a sample assembly is fixedly connected between the upper clamp and the lower clamp, and the sample assembly comprises an upper fracture sample block, a lower fracture sample block and a thermoplastic sleeve; the side, away from the lower clamp, of the upper clamp is in transmission connection with a transmission mechanism. The seepage mechanism comprises a water inlet pipe and a water outlet pipe, and the water inlet pipe and the water outlet pipe correspond to the crack; one end, far away from the water inlet pipe, of the water outlet pipe is communicated with a balance. According to the utility model, the upper and lower fractures can generate m