The butadiene twin screw compressor of a petrochemical company is a critical unit that directly affects the safe and stable production of the unit. During previous maintenance processes, the seal on the compressor's outlet side has leaked multiple times. After the maintenance in July 2024, the leakage rate of the seal on the compressor's outlet side was approximately 48 L/h, far exceeding the allowable leakage standard for mechanical seal (0.02 L/h). Due to the high cost of oil film mechanical seal spare parts, the conventional maintenance strategy of simply replacing the spare parts during maintenance is not only expensive but also fails to fundamentally solve the leakage problem of the compressor unit. In response to the above problems, the reasons for the mechanical seal leakage of this equipment were analyzed, and some treatment methods were developed.