An electric combined vibration type grain grading device, which consists of a rear-end frequency conversion motor, a rear-end motor seat, a transmission shaft, a spring sliding support, a universal roller, a left connecting rod, a rear crank, a slider, a connecting rod, and a lower connecting piece , base, right connecting rod, front-end variable frequency motor, front-end motor seat, front crank, front connecting rod, front connecting piece, grain bin, etc. Wherein the rear crank, slide block, connecting frame rod, lower end connector etc. form a swing guide rod mechanism. This mechanism swings reciprocatingly around the hinge point between the connecting frame rod and the lower end connecting piece through the drive shaft and driven by the frequency conversion motor at the rear end; at the same time, through the left connecting rod and the right connecting rod, the grain bin rotates around the hollow cylinder on the upper part of the base. The center of the bottom surface of the shaped slideway performs reciprocating left and right shimmy. The invention has the characteristics of high delamination efficiency, large delamination energy, stable operation and long service life.