Aiming at the shortcomings of the traditional explosionproof enclosure hydrostatic tester, a new type of explosionproof hydrostatic tester is designed. First, the mechanical structure of hydrastatic tester was designed. Based on Isostress theory and Finite Element Analysis (FEA) theory, the compression end cover, and other important components were designed, which made engineering materials of reasonable use. Second, the hydraulic system was designed. Finally, through the field test, verifies the validity of the design and easy operability of new hydrastatic tester are verified.