The invention discloses a combined tunnel computer car washing machine. The combined tunnel computer car washing machine includes a machine frame and a shed frame arranged at the top of the machine frame. A ceiling is fixedly welded to the top surface of the shed frame, and a panel groove is formed in the front surface of the machine frame. An operation panel is arranged on the inner side of the panel groove, an L-shaped plate groove is formed in the top end of the panel groove, an L-shaped sealing plate is arranged inside the L-shaped plate groove, and the width of the L-shaped sealing plateand the width of the panel groove are the same; the L-shaped plate groove, the L-shaped sealing plate, side slide bars, side slide grooves, spring chambers, semi-circular telescopic clamp blocks, semi-circular clamping grooves, arc-shaped clamping feet, oval clamping grooves, easy-to-insert inclined surfaces and push blocks are arranged, an operator can pull the L-shaped sealing plate downwards tothe inner side of the panel groove during daily use, an opening of the panel groove can be effectively blocked, so that external rain and dust and other foreign objects are prevented from falling into the inner side of the panel groove, and the inner side of the panel groove can be kept clean.