The invention provides a hydraulic circuit for reducing oil return backpressure. The hydraulic circuit for reducing the oil return backpressure comprises a first backpressure valve, an oil tank and a hydraulic control reversing valve, wherein an oil return pipeline is sequentially connected with the first backpressure valve and the oil tank, a first port of the hydraulic control reversing valve is connected with an oil inlet side of the first backpressure valve by virtue of a pipeline, a second port of the hydraulic control reversing valve is connected with an oil outlet side of the first backpressure valve by virtue of a pipeline, and a pilot oil source is connected with a control hole of the hydraulic control reversing valve by virtue of a pipeline to control on-off of the hydraulic control reversing valve. The hydraulic circuit for reducing the oil return backpressure has the beneficial effects that oil supplementing pressure of an oil inlet of a rotary motor can be met, negative pressure can not be formed at the oil inlet of the rotary motor, and cavitation can not be caused; and the oil supplementing pressure can be controlled, the oil return pressure is controlled when oil return flow of a system is large, and waste of the oil return pressure is reduced, so that power consumption is reduced.