Disclosed are an electric water sports device and a monitoring system. The electric water sports device includes a device body; wherein the device body is provided with a positioning system, a controller and an electric power acquisition module, wherein the controller includes an electronic map, the positioning system is configured to acquire positioning data of the electric water sports device and send the positioning data to the controller, the electric power acquisition module is configured to acquire electric power data of the electric water sports device and send the electric power data to the controller, and the controller is configured to determine the range of an electric fence in the electronic map according to the positioning data and the electric power data.