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1. A pump with variable suction/discharge amount, which is characterized in including a vane chamber body and a vane rotor; the vane chamber body internally having a vane chamber, and the vane chamber having a capacity space defined between a fixed wall member, a movable wall member and a movable vane chamber sleeve in the vane chamber body, the vane chamber being partitioned by an impeller of the vane rotor in the vane chamber into a plurality of eccentric vane chamber sections and a plurality of vanes being disposed on the impeller, and the number of the eccentric vane chamber sections being more than or equal to the number of the vanes; in the vane chamber, at any timing when the vane rotor continuously operates in the same direction relative to the vane chamber body, one of two lateral sides of each vane adjacent to another vane unchangeably being a suction side while another one of the two lateral sides of each vane adjacent to another vane unchangeably being a discharge side, and the suction side and the discharge side respectively having suction/discharge passages in communication with outer side of the pump; the fixed wall member being positioned in a fixed position in the vane chamber body; each vane having a corresponding symmetrical vane of the plurality of vanes, the angle of which is 180-degree different from the angle of the vane, whereby at any moment of the operation process; when the vane extends out of the impeller of the vane rotor, the 180-degree symmetrical vane is retracted into the impeller of the vane rotor, and when the vane is retracted into the impeller of the vane rotor, the 180-degree symmetrical vane extends out of the impeller of the vane rotor, so that the vane and the 180-degree symmetrical vane are complementary to each other; the movable wall member and the movable vane chamber sleeve being displaceable in an axial direction of the vane rotor relative to the fixed wall member to increase or decrease and change the capacity space of the vane chamber, so as to form the capacity space with variable suction/discharge amount.
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