Disclosed is a control valve (10). The control valve comprises a valve body (1) and a flow pre-setting assembly (8). The flow pre-setting assembly (8) comprises an adjusting rod (81), a control component (83) and an adjusting component (82), and the control component (83) is arranged on the bottom side of the valve body (1) in a manner of being capable of rotating around an axis and is connected, in a shape-matching manner, to an end of the adjusting rod (81) which extends out of the valve body (1), so as to drive the adjusting rod (81) to rotate; the adjusting component (82) is arranged in an inner cavity and fixedly connected to the adjusting rod (81), and the adjusting component (82) can be driven by the adjusting rod (81) to rotate between a first position and a second position, so as to set the maximum opening degree of the control valve (10). The control component (83) is provided with an indication part (831) on a surface facing the valve body (1) and/or on a surface facing away from the valve body (1), the deviation of the indication part relative to a reference position can indicate the maximum flow corresponding to the position of the adjusting component (82), the reference position is fixed relative to the valve body (1), the control valve is convenient for an operator to observe and realize flow pre-setting, and the above operation can be completed without disassembling and reassembling an actuator connected to the top of the valve body.