Oil-gas separation equipment

The utility model belongs to the field of transformer oil monitoring, and particularly relates to oil-gas separation equipment and a method thereof, the oil-gas separation equipment comprises a transformer oil chamber, a degassing chamber, a variable-volume chamber, an oil-gas separation chamber and a collection chamber, the transformer oil chamber is communicated with the degassing chamber through two pipelines a, one of the pipelines a is provided with a pump, the variable-volume chamber is used for extracting oil in the degassing chamber, and the oil-gas separation chamber is used for collecting oil in the oil-gas separation chamber. The variable-volume chamber is connected with the degassing chamber through a pipeline b, the height of the connecting point of the pipeline b and the degassing chamber is lower than the lowest liquid level of the degassing chamber, the degassing chamber, the oil-gas separation chamber and the collecting chamber are sequentially connected through a pipeline c and a pipeline d,