An early warning device for a new-energy battery is disclosed. The device includes a box body. The bottom of the right side of the inner cavity of the box body is provided with an outer shell. The inner cavity of the outer shell is fixedly connected to a battery housing. A filtration screen is fixedly connected to the front surface of the battery housing and in the inner cavity of the box body. Apositive-electrode connecting column is fixedly connected to the left side of the top of the battery housing and in the inner cavity of the box body. A negative-electrode connecting column is fixedlyconnected to the right side of the top of the battery housing and in the inner cavity of the box body. A liquid injection hole and a pressure relief explosion-proof hole are provided in the inner cavity of the box body and in the top of the battery housing in order from left to right. Through arrangement of a temperature sensor, a connecting bar, a connecting block, a drive motor, blades, a control panel, a single chip microcomputer, a data comparator, a power conditioner, a wireless transmitter and a prompting lamp, a problem that traditional novel new-energy batteries are not provided with an early warning function, and a problem that explosion is liable to occur when the temperature of surfaces of batteries rises continuously are solved.