The invention relates to a control valve. The control valve is characterized by comprising a valve block, a first channel and a second channel, the valve block is provided with an oil inlet, an oil return port, a first working oil port, a second working oil port, a third working oil port and a fourth working oil port; a first reversing valve element and a second reversing valve element are arranged in the first channel and the second channel respectively in a sliding mode; the two sides of the first reversing valve element and the two sides of the second reversing valve element form a first main control cavity, a first time control cavity, a second main control cavity and a second secondary control cavity, the first time control cavity and the second time control cavity are provided with afirst reversing valve element and a first spring and a second spring, and the first spring and the second spring are used for keeping the left moving trend; the valve block is further provided with afirst overflow valve and a second overflow valve for controlling the first reversing valve element and the second reversing valve element to move rightwards, and a one-way overflow valve communicating with the second working oil port and the fourth working oil port; and when the control valve works, the first overflow valve, the second overflow valve, the one-way overflow valve, the first springand the second spring are controlled, so that automatic reversing of the first reversing valve element and the second reversing valve element is carried out. The control valve is simple in structure and low in cost, the automatic control of a double-cylinder hydraulic turnover plough can be automatically completed, and the automation degree is high.