Offshore discarded platform piles removal wire saw is a kind of complex electromechanical integration equipment, and the seal of critical parts directly determines the service life of equipment. The seal structure of the drive wheel bearing chamber was described. When the temperature changed, the stress and dimensional variation mathematical model of its main components was obtained through analysis, and the experimental study was conducted according to the theoretical analysis results. Experimental results show that the impact of temperature changes on the seal structure must be considered, and the relevant parameters must be amended. The results provide a theoretical basis for the choice of key parameters in wire saw seal assembly.