The invention discloses a pressure-maintaining and gas-taking device of a deep-sea submarine hydrothermal solution sprayer. The pressure-maintaining and gas-taking device comprises a plurality of gasstorage containers and also comprises a framework and a semi-spherical gas production cover, wherein an opening of the gas production cover faces outwards and is fixed in the framework, a plurality ofthrough holes are formed in the top of the gas production cover, the gas storage container is fixedly arranged at the top of the gas production cover and communicates with the gas production cover bythe through holes, a gas production plane is arranged at the top of the gas production cover, the through holes and the gas storage container are arranged on the gas production plane, a handle is arranged at an outer side of the framework and extends outwards, a liquid sensor is arranged in the gas production cover, the gas storage container comprises a gas suction piston, a throttle valve, an exhaust pipe, a solenoid valve and an air inlet pipe, the gas storage container is fixedly arranged on the framework, and the gas inlet pipe communicates with the through hole. The pressure-maintainingand gas-taking device is simple in structure, the volume of the gas collected in the gas production cover can be observed, gas taking is automatically started after the gas volume reaches certain degree, and the pressure can be maintained at a gas-taking position.