The invention discloses a multifunctional agricultural machinery machining workbench. The multifunctional agricultural machinery machining workbench comprises a workbench body, two supporting plates are symmetrically and fixedly arranged on the workbench body, a top plate is fixedly arranged on the two supporting plates, a workpiece is arranged on the workbench body, a material clamping mechanismcorresponding to the workpiece is arranged on the workbench body, a cutting mechanism corresponding to the workpiece is arranged on the supporting plate on one side, a polishing mechanism corresponding to the workpiece is arranged on the supporting plate on the other side, a waste groove is formed in the side wall of the workbench body, a waste box is arranged in the waste groove in a sliding mode, an opening communicating with the waste groove is formed in the upper wall of the workbench body, and the opening corresponds to the waste box. According to the multifunctional agricultural machinery machining workbench, the workpiece of agricultural machinery can be cut, drilled and polished, multiple functions are integrated, so that the production efficiency of the agricultural machinery is greatly improved, the workpiece can be moved, rotated and fixed according to needs, and the machining is facilitated.