To optimize the quality cost of complex product supply chain is an important way to improve the quality management capability and reduce the quality risk in supply chain. Considering the product quality level and the product development cost, the concept of complex product quality value is proposed, and based on supplier network, the formation mechanism of complex product quality value is analyzed in detail. And then a GERT network model of complex product quality value is established, the quantitative calculation of complex product quality value is realized. On the basis of identifying the key suppliers in the network and establishing the optimization model, the quality cost optimization method of complex product supply chain considering the quality value is proposed. Finally, a numerical example is used to verify the scientificity and effectiveness of the model method.