The invention relates to the technical field of cleaning processes, in particular to a telescope housing cleaning process which comprises the following steps: S1, fixing; S2, preheating; S3, pre-degreasing; S4, high-temperature degreasing; S5, high-pressure water pressing; and S6, drying. According to the telescope housing cleaning process provided by the invention, such a manner that the fixing operation is performed at first and then the cleaning operation is performed in adopted; furthermore, the water washing procedure is simplified; the preheating operation is performed at first and thenthe degreasing operation is performed, and thus the efficiency is higher; the speed is high; the telescope housing cleaning process is simple and easy to implement; and the production cost is reduced.