Nuclear power plant spent fuel negative pressure unloading system

A nuclear power plant spent fuel negative pressure unloading system, comprising:

• a fuel element transport pipe and a gas transport pipe,
• wherein:
• the fuel element transport pipe comprises a fuel element output pipe, a fuel element lifting pipe, and a fuel element unloading pipe connected in series, the fuel element unloading pipe is arranged obliquely downward in the direction of movement of a fuel element, and the distal end of the fuel element unloading pipe is connected sequentially to a fuel loading apparatus and a transfer apparatus;
• the gas transport pipe is connected to either end of set positions of the fuel element output pipe and the fuel element unloading pipe respectively, a gas driving mechanism is connected to the gas transport pipe, and an inlet of the gas driving mechanism is arranged at one end in proximity to the fuel element unloading pipe for sucking gas in the fuel element transport pipe, the fuel loading apparatus and the transfer apparatus, and then release the gas to the fuel element output pipe via the gas transport pipe so as to drive the movement of the fuel element.