The invention discloses an assembling method of a connecting rod and a bearing shell of a compressor. The connecting rod and the bearing shell are included. The assembling method includes the following steps that the bearing shell is machined according to the external diameter interference magnitude of 0.08 mm-0.12 mm, then the bearing shell is soaked in liquid nitrogen to be cooled for 2 min-5 min, the bearing shell is taken out and immediately put in the small end of the connecting rod, the bearing shell stands still at room temperature, and after the bearing shell is restored to the room temperature, the bearing shell can be mounted in the small end of the connecting rod in an interference fit manner. Based on the principle of heat expansion and cold contraction, the external diameter machining interference magnitude of the bearing bush is increased, the bearing shell is soaked in the liquid nitrogen to be cooled, the external diameter of the bearing shell is reduced, the bearing shell can be easily put in the small end of the connecting rod, the bearing shell is restored to the original shape after standing still at the room temperature, the bearing shell and the small end of the connecting rod tightly expand together, no gap is left, and the assembling effect is good. The assembling method is simple and easy to operate, the service life of the connecting rod and the bearing shell which are assembled can reach 18 months or longer, the service life is long, and the maintenance frequency and the corresponding maintenance cost can be reduced. The strength of the connectingrod is guaranteed, the assembling method is economical and rapid, and therefore the production cost is reduced.