The invention provides a closed scanning galvanometer device for a laser machine. The device comprises a base, an X galvanometer mechanism, a Y galvanometer mechanism and a field lens mechanism. The Xgalvanometer mechanism comprises an X galvanometer motor, an X galvanometer lens and an X galvanometer base which is provided with an X positioning hole, the Y galvanometer mechanism comprises a Y galvanometer motor, a Y galvanometer lens and a Y galvanometer base which is provided with a Y positioning hole, the field lens mechanism comprises a field lens, the front end of the base is provided with a laser incidence hole, the bottom of the base is provided with a field lens installation hole, the field lens is installed in the field lens installation hole, the X positioning hole, the Y positioning hole, the field lens installation hole and the laser incidence hole are mutually connected in a cavity, and the cavity is provided with no other through hole except for the X positioning hole, the Y positioning hole, the field lens installation hole and the laser incidence hole. The scanning galvanometer device fixes the Y galvanometer motor, the X galvanometer motor and the field lens, therelative positions are more stable, the closed cavity is formed in the base after fixing, and dust pollution is small when a laser beam passes.