The advantages of hot die forging servo press were described on the basis of analysis of traditional hot die forging. The key technologies of hot die forging servo press included driving motor， working mechanism， transmission scheme and so on. The rationality of application of AC asynchronous motor， frequency conversion motor， switched reluctance motor and AC servo motor in hot die forging servo press was analyzed in aspect of driving motor. A new method which used the triangular connecting rod toggle mechanism on hot die forging servo press was proposed in aspect of working mechanism. Multi motor drive， multi gear transmission and multi drive mechanism synchronization scheme were studied in transmission scheme. At last， the key technologies of hot die forging servo press were summarized.