Water, fertilizer and gas integrated irrigation fluid pressurization system

The invention provides a water-fertilizer-gas integrated irrigation fluid pressurization system which comprises a liquid conveying pipe, a liquid pump is arranged at one end of the liquid conveying pipe, a filtering device is arranged at the other end of the liquid conveying pipe, and a Venturi fertilizer applicator is arranged on the liquid conveying pipe; the fertilizer liquid tank is used for containing fertilizer liquid and is provided with a second liquid conveying pipe, and the second liquid conveying pipe is connected with the Venturi fertilizer applicator; the gas conveying source comprises a gas outlet; the stirring device comprises a stirring shaft arranged in the fertilizer liquid tank and a power unit in driving connection with the stirring shaft, the power unit comprises a pneumatic motor, and the pneumatic motor is connected with the air outlet; when water, fertilizer and gas are supplied at the same time, gas supplied by the gas source can firstly pass through the pneumatic motor, the gas flow