The utility model discloses a blade hinge piston combined type variable -displacement pump, including the pump case body, adjustable ring, rotor, a plurality of blade, rotatory jar and the piston equal with blade quantity. The both ends of each blade are equipped with first articulated axial region and the articulated axial region of second respectively, rotatory jar rotationally sets up in the adjustable ring, the rotor rotationally sets up in rotatory jar, one of them person of the inner peripheral surface of rotatory jar and the outer peripheral face of rotor be equipped with respectively with a plurality of pistons a plurality of radial slots of complex one by one, wherein another person of the inner peripheral surface of rotatory jar and the outer peripheral face of rotor be equipped with respectively with the first articulated axial region of a plurality of blades a plurality of first articulated shaft holes of complex one by one, terminal surface that a plurality of pistons are close to blade one end be equipped with respectively with the second of a plurality of blades hinge the axial region one by one a plurality of seconds of complex hinge the shaft hole. The utility model has the advantages of the jamming can not appear in small, light in weight, blade during operation, application scope is wide.