Non-steady state detection device and non-steady state detection method for permeability of low-permeability rock

The invention discloses a non-steady state detection device and a non-steady state detection method for permeability of low-permeability rock. The detection device comprises a rock core holder for holding a rock core sample, wherein the side wall of the holder is connected to an annular pressure pump; the holder is provided with an inlet pipeline and an outlet pipeline; an inlet buffering container is arranged in the inlet pipeline; an outlet buffering container is arranged in the outlet pipeline; a check loop is connected to the holder in parallel; a check cylinder is arranged in the check loop. Due to the adoption of the non-steady state detection device for the permeability of the low-permeability rock, the permeability of the low-permeability rock core can be detected quickly and accurately; the permeability of the low-permeability rock core sample can be detected through two non-steady state detection methods; the device is simple to operate, accurate to test and capable of adjusting the volume of the in