The invention discloses a linkage structure of a liquid reservoir case and a sleeve, and relates to an automobile refrigeration component and overcoming the defect existing in the prior art that the sleeve is easy to fall off from the case; a circular through hole is arranged on the case and the external diameter of the sleeve comprises a large diameter section and a small diameter section. The invention is characterized in that the diameter of the small diameter section is smaller than the diameter of the through hole, the diameter of the big diameter section is bigger than the diameter of the through hole, the small diameter section is arranged inside the through hole, a teat is arranged from the inner wall of the sleeve towards the outer wall, and the teat props against the inner wall of the through hole. The invention has the advantages that the sleeve is riveted and fixed on the case via arranging the teat which props against the inner wall of the through hole of the case on the small diameter section of the sleeve which is clearance-fitted with the through hole of the case, so as to effectively prevent the sleeve from falling off; the operation is simple without producing scraps, thereby favoring keeping clean; in addition, due to the adoption of aluminum materials, the plasticity of aluminum is fully utilized so as to provide guarantee in materials for the application of the invention.