The present invention is directed to a hydraulic double-acting hand pump in which a high and low pressure side fluid supply grooves are formed in a top surface, a fluid inlet is formed in a bottom surface, a body in which the fluid outlet is formed in a side surface is provided, a piston is inserted into and coupled to the high and low pressure side fluid supply grooves, an upper end of the piston is connected and fixed to a handle rotatably installed in the low pressure side fluid supply groove of the body, the piston alternately and repeatedly ascends and descends to supply fluids to the high and low pressure side fluid supply grooves, and the fluids are discharged through the fluid outlet of the body by pushing the fluids inside the high and low pressure side fluid supply grooves.