The invention relates to a processing technology of a computer case. The processing technology comprises the following steps that S1, an engineering drawing is drawn; S2, numerical control stamping isconducted; S3, laser cutting is conducted; S4, numerical control bending is conducted; S5, grinding is conducted; S6, multi-head tapping is conducted; S7, automatic rivet pressing is conducted; S8, automatic spraying is conducted, specifically the case is hung on hanging hooks, an external transmission mechanism is controlled to conduct transmission, and a cleaning device is controlled to clean an aluminum alloy bracket, wherein the cleaning device comprises a rear supporting plate, a rear part push rod, a rear cleaning plate, an electric sliding block, a cleaning connecting bracket, a rear cleaning mechanism, a lateral cleaning mechanism, a front cleaning mechanism a front part air cylinder, and a front supporting plate; S9, spraying solidification is conducted; and S10, the case is mounted. The processing technology can solve the problems that when an existing case bracket is cleaned and sprayed, the case bracket can not be locked, the case cleaning effect is poor, a plurality of persons are needed for spraying the front surface, the rear surface and the lateral surfaces of the case when the case bracket is sprayed, and the angle can not be adjusted when the case bracket is sprayed.