The invention relates to a lifting net box with an inner liner and a lifting support system of the lifting net box. The invention consists of two parts: the net box with the lifting function and the lifting support system, wherein the net box is provided with the telescopic inner liner and mainly comprises a floating pipe, the inner liner, a separation plate, a ventilation main pipe, a ventilation hose, an air distribution pipe, a water communication pipe, a safety cap and the like, and the lifting support system mainly comprises an air pump, a communication pipe, an exhaust pipe, a valve, a flow rate distributor, an air distribution joint and an air pressure meter. The lifting support system on the sea level is connected to the ventilation main pipe through the ventilation hose and is then connected to the inner liner arranged in the floating pipe of the net box through the air distribution pipe, the inner liner can expand and contact under the effect of the air pump, a water body in the floating pipe is discharged when the inner liner expands, the upward floating of the net box is realized, the water body outside the net box enters the floating pipe from the water communication pipe through the siphon effect when the inner liner contacts, the downward sinking of the net box is realized, and the downward sinking is automatically stopped when the net box sinks down to a degree that a sinking element suspended at the bottom of a fishing net is in contact with the sea bed.