Small-size rock core permeability testing method and device

The invention discloses a small-size rock core permeability testing device which comprises a constant-temperature box, a device platform is fixedly installed in the constant-temperature box, a top plate is installed on the edge of the device platform through a plurality of guide screws to form a testing frame, and a porous disc and a plugging block are arranged in the testing frame from bottom to top. A test loading position is arranged on the porous disc, an O-shaped sealing ring is mounted at the bottom of the plugging block, the plugging block is driven by the guide screw to extrude a rock core sample to form a closed upstream test cavity, and a downstream reference cavity is formed below the contact surface of the porous disc and the rock core sample; the invention further comprises a corresponding test method. According to the invention, a small-size rock core sample can be effectively utilized to measure the permeability in an epoxy resin wrapping manner, the requirement on the quality of the sample is