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Remote manual control for USVs is essential when a USV fails to navigate or traps into a complicated river. Conventional transmitters and receivers are widely used to provide the utility of remote manual control for USVs. However, constrained by the power of transmitter, the communication distance between the USV and the user is limited. In this paper, a 4G-based remote control system for USVs is proposed. With the help of live video from a camera deployed on the USV, users can remotely control the USV using an Android APP and the 4G network. Compared to traditional remote control methods, our approach dramatically extends the control distance and improves the control flexibility of USVs. The approach is applied to a USV for water quality monitoring. Experimental results show that it has small communication delay and can remotely control the USV during the navigation.