The utility model relates to a cooling control system of a dual-clutch gearbox, which relates to a hydraulic control loop, is simple in structure and can selectively cool clutches. The cooling control system comprises a cooling oil tank and a pump, an input end of the pump is communicated with the cooling oil tank, an output end of the pump is communicated with a main pressure pipeline, the main pressure pipeline is provided with a main pressure regulating valve, the main pressure regulating valve comprises a first bias component and a valve component, a right control end of the valve component is communicated with the main pressure pipeline, a working oil port A of a main pressure regulating electromagnetic valve is connected with a left control end of the main pressure regulating valve, a first clutch hydraulic pipeline and a second clutch hydraulic pipeline are respectively communicated with a first clutch and a second clutch, a hydraulic control two-position three-way valve is further arranged between the first clutch hydraulic pipeline and the second clutch hydraulic pipeline, and the first clutch hydraulic pipeline and the second clutch hydraulic pipeline are respectively connected with a left control end and a right control end of the hydraulic control two-position three-way valve.