Methane removal device

The utility model discloses a methane removal device, which comprises a methane separation cylinder and a liquid nitrogen interlayer tank wrapped on the outer side of the methane separation cylinder, the top of the methane separation cylinder is connected with a gas inlet pipeline, a gas exhaust pipeline and a detection branch, and the bottom of the methane separation cylinder is connected with a methane discharge pipeline. According to the utility model, the end, connected with the methane separation cylinder, of the detection pipeline extends into the methane separation cylinder, and the helium is detected through the gas sampler, so that when the gas sampler cannot detect the concentration of the helium, the detection pipeline is started to detect the concentration of the helium; if yes, it is indicated that the liquid level of the liquid methane in the methane separation cylinder is located above the plane where the end, extending to the methane separation cylinder, of the detection pipeline is located, t