High-viscosity liquid feeding booster pump

A booster pump comprising:

• a body having an actuator mounted at one side thereof and a discharge valve formed at the other side thereof, the body being formed internally with a chamber;
• a plunger configured to be inserted into the body, and advanced or retracted relative to the body by the operation of the actuator to generate a compressive force or a suction force;
• and
• a charge valve disposed at an intake port formed at an upper portion of one side of the body in such a manner as to be spaced apart from a discharge valve, and configured to be opened or closed in cooperation with the advancing or retracting operation of the plunger to supply a fluid to the inside of the body or interrupt the supply of the fluid,
• wherein the body includes a charged liquid feeding passage spirally formed on the inner peripheral surface of the chamber thereof in such a manner as to fluidically communicate with the intake port connected to the charge valve, and
• wherein the charged liquid feeding passage has an outlet formed in proximity to the discharge valve.