The invention provides a net cage and a method for lifting a netting of the net cage. The net cage comprises a cage body, the netting, a limiting part and winches, wherein the netting comprises an annular side net and a bottom net arranged at the bottom of the side net; the top of the side net is fixed with the top of the cage body, the bottom of the side net is connected with the periphery of thebottom net, and a lifting rope is arranged on one side edge of the side net; two ends of the limiting part are fixed at the top and bottom of the cage body respectively, the lifting rope is glidinglyconnected with the limiting part, and the lifting rope moves along the limiting part; the winches are arranged on the cage body, steel wire ropes of the winches are connected with the lifting rope and the winches drive the lifting rope and the netting to be lifted along the limiting part. In the net cage, the winches are started and drive the lifting rope and the netting to be upwards lifted along the limiting rope, the lifted netting and lifting rope are stacked together, so that the ratio of fish to water in the net cage is greatly increased, and recovery of adult fish is facilitated.