Disclosed is a hydraulic circuit for controlling hydraulic oil supplied from a single hydraulic pump to a plurality of hydraulic actuators. The hydraulic circuit, according to the present invention, comprises: at least one hydraulic actuator driven by hydraulic oil of a hydraulic pump; a metering valve that supplies the hydraulic oil of the hydraulic pump to the hydraulic actuator and drains the hydraulic oil, which is discharged from the hydraulic actuator, to a hydraulic oil tank when being switched, and compensates for the pressure generated while the hydraulic actuator is being driven, by supplying the hydraulic oil of the hydraulic oil tank to the hydraulic actuator when the pressure drops to the set pressure of the hydraulic oil tank or less; a check valve for preventing backflow that is installed on a first relief flow passage that is connected to opposite ports of the hydraulic actuator to communicate with the ports; and a port relief valve installed on a second relief flow passage to drain a part of
