Shelf assembly and refrigerator

The invention provides a shelf assembly which comprises a shelf which comprises a shelf plate and cantilever beams symmetrically arranged on the two sides of the shelf plate. The sliding plate comprises a fixing piece and a connecting piece; the fixing piece is clamped with the connecting piece; the lifting modules are symmetrically arranged on the two sides of the shelf; the lifting module comprises a gearbox, a supporting frame and a plurality of lead screws. One end of the screw rod is connected with the gearbox, and the other end of the screw rod is connected with the support frame; the motors are connected with the gear box, and the number of the motors is the same as that of the racks; two ends of the connecting rod are respectively connected with the gear box; one end of the supporting rod is connected with the gearbox, and the other end of the supporting rod is connected with the supporting frame; the sliding plate is connected with the cantilever beam through a fixing piece; the sliding plate penetra