The utility model discloses an active carbon filtering device convenient to assemble and disassemble. The active carbon filtering device comprises a filtering body, a gas inlet pipe, a gas outlet pipe and a filtering assembly, wherein the filtering body is of a barrel structure and is internally of a cavity structure; the upper end of the cavity structure is opened so that the filtering assembly can be conveniently taken out of and put into the cavity structure; the gas inlet pipe and the gas outlet pipe are fixedly arranged at the lower part and the upper part of the filtering body and are communicated with the inner cavity of the filtering body; the filtering assembly is detachably arranged in the filtering body and is in sealed connection with the upper end of the filtering body; and gas to be filtered enters the filtering body through the gas inlet pipe, moves from bottom to top and is finally discharged by the gas outlet pipe after being filtered by the filtering assembly. The active carbon filtering device is simple in structure and rapid and convenient in loading and unloading; and the difficulty in replacement of active carbon is small.