Abstract: High-feed milling is a milling method that adopts small depth of cut and large feed, and has high processing efficiency and processing quality in deep cavity processing. A simulation model of high-feed milling 34CrNi3Mo high strength steel was established to study the effect of cutting parameters on cutting temperature. The simulation research plan is designed by orthogonal test method, the cutting temperature obtained by simulation is studied by means of range analysis and variance analysis, and the empirical formula of cutting temperature is obtained according to multiple regression analysis method. The results show that the cutting efficiency of machining high-strength steel is improved by high-feed milling with increasing the cutting depth, which is conducive to avoiding a large increase in cutting temperature.