Embodiments of the present invention disclose a method and device for warning overdischarge of a battery, a battery and an aerial vehicle. The battery is configured to supply power to a moving platform. The method includes: acquiring a number of times of overdischarge damage of the battery, where the number of times of overdischarge damage is obtained based on minimum voltage values of the battery in previous discharge processes and a preset overdischarge judgment criterion, and the preset overdischarge judgment criterion is less than a voltage threshold of overdischarge of the battery; and giving a battery overdischarge warning according to the number of times of overdischarge damage of the battery.