Breathing gas monitoring device for crude oil storage tank

The utility model relates to the technical field of oil storage tank breathing devices, in particular to a crude oil storage tank breathing gas monitoring device which comprises a valve body, the lower end of the valve body is connected with a pipeline at the upper end of a storage tank body, a positive pressure valve device is arranged at the upper end of the valve body, and a negative pressure valve device is arranged on one side of the valve body. A flange plate assembly is arranged at the upper end of the valve body, the positive pressure valve device is composed of a protective cover, a supporting cylinder, exhaust holes, a positive pressure valve disc and a first damping device, the upper end of the flange plate assembly makes contact with the first damping device, the first damping device is installed at the lower end of the positive pressure valve disc, the supporting cylinder is arranged at the upper end of the flange plate assembly, the protective cover is arranged at the upper end of the supporting