The invention relates to the technical field of doors and windows, in particular to a sound insulating bridge of an inward opening window. The sound insulating bridge is arranged on the inward opening window, the sound insulating bridge is of a cavity structure formed by a sound insulating bridge buckled cover, a beam and a transfer frame, the sound insulating bridge is connected with the beam, sashes and glass through adhesive tapes, and the multiple groups of adhesive tapes are matched, so that the sound insulating effect is greatly improved. The sound insulating bridge of the inward opening window has the beneficial effects that the sound insulating bridge of the inward opening window is reasonable in design, simple in structure and convenient to use; the problem of poor sound insulation effect is fundamentally solved, and after using the sound insulating bridge of the inward opening window, the sound can be lowered from 60 decibels to 10 decibels or less; and the overall structure is good in sealing effect, long in service life and easy to install.