Coal mine gas sampler

The utility model relates to the technical field of coal mine detection equipment, and provides a coal mine gas sampler which comprises an annular plate, a first cylinder body with an opening in the bottom is inserted into the top of the annular plate, a second cylinder body with an opening in the bottom is fixedly connected to the top of the first cylinder body and is coaxial with the first cylinder body, and a liftable mounting block is inserted into the top of the inner wall of the second cylinder body. A drill bit with the bottom penetrating through the top of the first cylinder, extending into the first cylinder and capable of rotating is arranged at the bottom of the mounting block, and one side of the surface of the second cylinder is fixedly connected with a collecting cylinder through a support. The conical end at the bottom of the drill bit can be screwed into the ground to complete punching, after the drill bit is reset, gas in a hole can enter the first barrel, at the moment, the gas in the first