The invention discloses a manufacturing process of an intermediate heat exchanger for an automobile air conditioner. The manufacturing process comprises following steps: 1), manufacturing of a first positioning support plate and a second positioning support plate; 2), manufacturing of strip-shaped cooling fins; 3), manufacturing of collecting pipes and a connecting assembly; 4), assembly of parts; 5), pilot run of the intermediate heat exchanger. According to the manufacturing process, the steps are simple, manufacturing is convenient, the processing time is shortened, the processing and maintaining costs are reduced, mass production of the intermediate heat exchanger is realized, different types of heat exchangers can be produced on the same production line simultaneously, the practical flexibility of the heat exchanger is enhanced, and the practicability of equipment is improved.