The invention discloses a fast corn seed threshing device. The fast corn seed threshing device comprises a motor, a feeding hopper, a threshing roller, a threshing chamber, a vibrating screen and ironwheels; strip-shaped seed discharging holes are transversely formed in the arc bottom of the threshing chamber; a plurality of fixed stripping teeth are fixedly connected to the threshing chamber through screws, a plurality of movable stripping teeth are welded to the surface of the threshing roller and are spirally distributed on the surface of the threshing roller, thus, through rotation of themovable stripping teeth on the threshing roller, corncobs can be driven to be forcefully rubbed between the fixed stripping teeth on the inner surface of the threshing chamber, seed-core separation of the corncobs is achieved accordingly, seeds fall onto the vibrating screen through the seed discharging holes of the threshing roller, and through vibration of the vibrating screen, the seeds and fine impurity particles are further screened. By means of the fast corn seed threshing device, timely and effective treatment of the corncobs is completed, the breakage rate of the corn seeds is reducedto a certain extent, and meanwhile complete separation of debris and the corn seeds is achieved.