Galvanic cell oxygen sensor

The invention discloses a primary battery oxygen sensor, belongs to a primary battery oxygen sensor in the technical field of gas sensors, and aims to solve the technical problem in the prior art that an electrolyte and an electrode are damaged due to a neutralization reaction between acidic gas and an alkaline electrolyte after the acidic gas enters the sensor. The device comprises a base and an upper cover, wherein a space between the upper base and the upper cover forms an induction air chamber of the primary battery; small gas diffusion holes are formed in the gland and the upper cover; a second waterproof breathable layer is arranged on the surface of the gland, a first waterproof breathable layer is arranged on the surface of the upper cover, and a gas absorption layer is arranged between the first waterproof breathable layer and the second waterproof breathable layer. The gas absorption layer is arranged to remove acid gas entering the gas, the influence of the acid gas on an electrode and an electroly