The invention relates to a weft insertion control device on a loom, in particular to a main jet, supplementary main jet, auxiliary jet and magnetic valve integrated weft insertion mechanism for an air-jet loom. The integrated weft insertion mechanism comprises a main jet and magnetic valve integrated structure and a supplementary main jet and magnetic valve integrated structure, as well as auxiliary jet and magnetic valve integrated structures, wherein the supplementary main jet and magnetic valve integrated structure is arranged at the front end of the main jet and magnetic valve integrated structure 1 and in series connection with the main jet and magnetic valve integrated structure 1; the auxiliary jet and magnetic valve integrated structures are distributed in the forward direction of weft yarns and fixedly connected with a loom reed base. According to the main jet, supplementary main jet, auxiliary jet and magnetic valve integrated weft insertion mechanism for the air-jet loom, magnetic valves are directly connected with the main jet, the supplementary main jet and the auxiliary jet respectively through valve seats, so that air flow stagnation caused by retention of compressed air in air pipes is avoided successfully, the waste of air sources is avoided, the response speed of jets is improved, and the weft insertion rate is increased.