The invention discloses an integral double-cylinder inflator. The integral double-cylinder inflator comprises a base; the base is provided with an outer pipe and an exhaust pipe; an adjusting valve module is arranged at the middle part of the outer pipe; a piston cylinder is formed at the upper part of the adjusting valve module in the outer pipe; an air storage cylinder is formed at the lower part of the adjusting valve module in the outer pipe; a lower air pipe is arranged between the lower end of the adjusting valve module and the base; the center of the lower air pipe conducts with the exhaust pipe; a cylinder jacket is arranged at the upper end of the piston cylinder; a piston rod is arranged in the center of the cylinder jacket; the upper end of the piston rod extends out of the outer pipe to connect with a holding handle, and the lower end is connected with a piston; a valve element of the adjusting valve module is rotated to finish the state switching; in an inflation state, the piston cylinder conducts with the lower air pipe through the valve element; in an air storage state, the piston cylinder conducts with the air storage cylinder through the valve element; and in high-pressure exhausting, the air storage cylinder conducts with the lower air pipe through the valve element. The integral double-cylinder inflator has the advantages of reasonable structure, low manufacturing cost and convenience to use, and can meet inflation demands of general tires and vacuum tires.