The utility model belongs to the medical appliance field and relates to a continuous and micro-dosage venous transfusion system pushed by a spring. The continuous and micro-dosage venous transfusion system comprises a disposable injector, a cylindrically coiled compression spring, a sleeve and a disposable perfusion tube. The continuous and micro-dosage venous transfusion system utilizes the elastic force of the spring compressed in the sleeve as a power source for repeated use, takes the all-purpose disposable injector as a medicine liquid storage device, adopts a flow limiting pipe to realize the control of the flow, therefore, deficiencies that the existing continuous and micro-dosage venous transfusion system intervened by a plurality of apparatuses has bad convenient and fast and comfort abilities, and the apparatuses have high manufacture cost and large resource consumption, thereby having better clinic practicability, safety and convenient and quick ability.