The invention discloses a making method of a low-emission composite function coated filter bag and belongs to the technical field of industrial environment protection dedusting. The coated filter bag comprises a tubular bag body and a round bag bottom. The making method includes following steps: 1), pretreating a filter bag material: cutting to obtain bag body and bag bottom materials, arranging a pre-binding position, and utilizing a PTFE thin film remover to remote a PTFE thin film layer on the outer side of the pre-binding position; 2), adhering the pre-binding position through hot rolling adhesion or hot melting adhesion to obtain the coated filter bag without needle holes. The making method solves the problem that an existing coated filter bag cannot realize hot melting lapping due to the fact that the PTFE thin film layer has high lubricating non-sticking performance, the coated filter bag made by the method is free of the needle holes, and dust capture efficiency is high and reaches 1mg/Nm3; by increasing width of a lapped position and thickness of an adhered position, mechanical strength of the filter bag is improved, and service life is prolonged.