Double piston type pressure vacuum gauge

The invention relates to a double piston type pressure vacuum gauge which comprises a simple piston, a differential piston and an oil pipe connecting the simple piston and the differential piston. The simple piston and the differential piston are fixed on a piston cylinder seat board. The upper parts of the simple piston and the differential piston are provided with pallet seat frames, pallets and counterweight pallets. The pallets are respectively on the corresponding pallet seat frame. The counterweight pallets are respectively on the corresponding pallets. The lower parts of the simple piston and the differential piston are provided with cylinder combination members. The cylinder combination members comprise piston cylinders, piston cylinder seats and cylinder caps. The piston cylinders of the simple piston and the differential piston are fixed on piston cylinder seats through cylinder caps. Through an improvement design of pistons, piston cylinder structure and material of a present double piston type pressure vacuum gauge, the piston and piston cylinder in the invention has the advantages of good wearability, long service life and convenient cleaning. And the accuracy control of double piston rods in working is ensured.