Wellhead sampling device for coal-bed gas well

The utility model belongs to the technical field of sampling devices, and particularly relates to a coal-bed gas well mouth sampling device which comprises sampling equipment, a plurality of sliding grooves are annularly formed in the lower side wall of the sampling equipment, supporting assemblies are installed in the sliding grooves and comprise sliding blocks, the sliding blocks are installed in the sliding grooves in a sliding mode, and the sliding blocks are connected with the sampling equipment. A cavity is formed in the sampling equipment; by rotating the second gear ring, the threaded rod extends out of the sliding groove and is erected on the wellhead, so that the sampling equipment is placed on the wellhead for sampling work, compared with the prior art, supporting is stable, the threaded rod can be effectively prevented from contracting during supporting, meanwhile, the outer edge of the wellhead is hooked through the clamping plate, and the sampling efficiency is improved. The sampling device can