Oil-gas separation device for negative pressure sampling of transformer oil

The utility model belongs to the technical field of oil-gas separation, and particularly relates to a transformer oil negative pressure sampling oil-gas separation device which comprises a sampling container, an air pump communicated with an air outlet and a three-way valve sequentially connected with an output port of the air pump. The gas in the sampling container is discharged through the gas pump, the gas outlet is internally provided with the one-way valve I, so that the unexpected condition of gas backflow can be prevented, the influence of air or other gases on a measurement result is reduced, negative pressure is formed, hydraulic oil can smoothly enter the sampling container from the oil inlet, and the sampling container can be taken out only by closing the outlet, communicated with the outside, of the three-way valve I; gas separated out from the hydraulic oil pumped by the air pump enters the spectrum detection equipment through the three-way valve and bubbles into the hydraulic oil through the oil