The work aims to alleviate the problem of a large amount of labor in the current harness coating processing procedure at home. The automatic harness wrapping machine that could realize the tape wrapping of the multi-branch harness was designed to achieve the automatic wrapping and cutting of the tape as well as the bundling of multi-branch harness in the coating process. Through the harness tension test, the tension control range was obtained, which provided the basis for the design of the threading mechanism and the harness tension control. At the same time, a set of automated winding control system schemes were designed. The end points and the intersection coordinates of the harness were acquired by image processing techniques. The equipment could complete the wrapping of the harness tape and its tape wrapping efficiency was improved, 4.7 times higher than that of the manual. The R & D of the equipment realizes the automatic harness coating, which improves the production efficiency of harness tape wrapping.