The design principle of automatic high hydrostatic pressure equipment, its structural characteristics and major technical difficulties were introduced. The structure and the optimum parameters of high pressure intensifier, check valve, relief valve, sealing system and temperature sensor system were studied and confirmed. The results of performance test prove that it has the advantages of reasonable structure, easy operation, steady performance and reliable security. Furthermore, several batches of fresh peach juice were processed by using this equipment, and the results showed that commercial sterilization was achieved after treated by HHP at 600MPa for 5min.