Abstract: Based on the structural characteristics and technical requirements of the rocker arm connecting rod, the mechanical processing technology regulations for this part are formulated in this article. On the basis of analyzing the positioning device, fixture device and specific clamp, the drilling fixture for the sixth process of processing Φ 35 hole has been designed and manufactured. The use results indicates that this fixture has the characteristics of ensuring machining accuracy, reasonable design scheme, simple and practical structure, and can improve the machining quality and efficiency of the rocker arm connecting rod.