A hydraulic oil circulating system comprises a high pressure oil tank, a low-pressure oil tank, a switch assembly and a plurality of pressure-regulating reversal valves. The hydraulic oil circulating system enables hydraulic oil of all hydraulic devices to flow into the low pressure oil tank through a pressure-relief feedback pipe orifice, and then to be pressed into the high pressure oil tank uniformly to achieve circulation continued distribution, the condition that one hydraulic oil circulating system can correspond to the hydraulic devices on different links is achieved, not only is the optimization of structural design facilitated, but also the integration level of the hydraulic oil circulating system is improved. Moreover, the utility model further provides a central hydraulic pump using the hydraulic oil circulating system.