The utility model discloses a microwave is presented can device based on large -scale rotary device, it includes rotary device (1), installs in arc waveguide (2) of rotary device (1) periphery, installs inhibitor (3) in the upper and lower position of arc waveguide (2), rotary device (1) is circular, and the cross -section of rotary device (1) is concentric with the cross -section of arc waveguide (2), the last microwave feed -in groove (4) of having seted up of rotary device (1) circumferential edge, set up on arc waveguide (2) with the corresponding slot of microwave feed -in groove (4) size. The utility model has the advantages of reasonable design, the security is good, and no microwave leakage can realize that waveguide and rotary device's science combine, and the microwave distributes evenly, can improve the heating efficiency of microwave greatly, and especially to large -scale rotary device, microwave heating efficiency is higher, can solve conventional fixed waveguide and can't realize presenting the technological problem that can be connected with rotary device, also can solve unable uniformly action in the difficult problem of material of large -scale rotary device microwave simultaneously.