The invention discloses an upper cover of a multi-functional spin-vibration screening machine. The upper cover comprises an upper cover body. A buffer board is mounted at the upper bottom of the inner wall of a feed opening of the upper cover body. Material passing holes are uniformly distributed in the surface of the buffer board. At least two observation windows are symmetrically mounted on the upper cover body at the periphery of the feed opening. The upper cover has a dust prevention function, and has the advantages that the working conditions of a screen stencil is conveniently observed, materials are prevented from falling to directly impact the screen stencil, and the service life of the screen stencil is prolonged.