The rapid development of modern computer network technology has also greatly promoted the development of libraries towards digitization and informatization. Especially in the context of the continuous improvement of China's comprehensive international competitiveness, the development model of various industries has also been fundamentally changed, which has led to the improvement of the application value of Network Computer in digital libraries. Based on this, this article conducts more in-depth research and discussion from three aspects: the application characteristics of digital library computer network security technology, the problems in the application of digital library computer network security technology, and the analysis of protective measures in the application of digital library computer network security technology.