The utility model discloses a group delay modulator based on electromagnetism is induced transparent, including last cavity (1) that constitutes standard rectangular waveguide, cavity (2) down, insert standard rectangular waveguide and go up medium base plate (3) between cavity (1) and lower cavity (2), a go up cavity (1) that is used for fixed two pins (4) in medium base plate (3) location and is used for standard rectangular waveguide, fixed four screw (5) are fixed a position in cavity (2) down, rectangle becket (33) the interact at medium base plate (3) the positive shape of falling L resonance unit (31) and anti - L shape resonance unit (32) and medium base plate (3) back, obtain the group delay peak value of three variation in size, the regulation and control of realization group delay. The utility model discloses in can be used to various electronic instrument and communication system, its advantage is compact structure, it is integrated to be convenient for, the regulation and control scope is big, and delay on multiple populations regulation and control can come light the realization through the medium base plate of changing the different resonance structure of loading.