The invention provides a flow control valve and a flow control valve system. The flow control valve comprises an actuating mechanism, a valve body and a valve core. The actuating mechanism is internally provided with a motor. The valve core is arranged in a cavity of the valve body. A valve rod of the valve core is connected with the motor. A valve seat of the valve core is driven by the motor to move between an inlet and an outlet of the cavity. A plurality of spacing structures are arranged in the positions, corresponding to the moving zone of the valve seat, of the inner wall of the cavity. A runner is formed between every two adjacent spacing structures. The width of the portion, close to of the inlet side of the cavity, of each runner is different from that of the portion, away from the inlet side of the cavity, of the runner so that the flow rates can be different when the valve seat is located in different positions. Through the flow control valve and the flow control valve system, the flow rate of liquid can be stably and precisely controlled, and the flow controllability of the flow control valve is improved.