Concrete impermeability testing device

The utility model discloses a concrete anti-permeability performance testing device which comprises a concrete anti-permeability experiment control box, a water injection surge tank and a concrete test piece sealing and fixing device, and one end of the water injection surge tank is communicated with the concrete anti-permeability experiment control box; the concrete test piece sealing and fixing device comprises a fixing screw rod, an upper fixing plate, an upper pressure sealing ring, a lower pressure sealing ring, a lower fixing plate and a pressure water injection pipe; the upper fixing plate and the lower fixing plate are detachably mounted on the fixing screw rod up and down; the upper pressure sealing ring is arranged at the bottom of the upper fixing plate; the lower pressure sealing ring is arranged at the top of the lower fixing plate; one end of the pressure water injection pipe is communicated with the water injection surge tank through a pressure-resistant pipe, and the other end is fixedly conne