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As the development of electronic equipment such as radar goes thinner with a higher power, the demand for the heat dissipation capacity of the liquid cooling system is increasing. As one of the core components of electronic equipment, a liquid cooling case is very important for efficient and reliable heat dissipation. The complex structure design and highly precise assembly requirements have put forward great challenges to traditional manufacturing methods. In this paper, the research statuses of the liquid cooling case at home and abroad are reviewed, and the main manufacturing methods, heat dissipation methods and heat dissipation performance are introduced respectively. Meanwhile, taking a certain type of liquid cooling case as the research object, we explore the manufacturing method of friction stir welder case based on narrow forest steps, carry out research on the technology of case conformation correction and cleanliness control, and successfully make the liquid cooling case meet the requirements of weld performance, case strength and flow channel cleanliness. The process has a clear route with fixed parameters and good implementability and can be used for the mass production of highly integrated liquid cooling cases.