The invention relates to an electric quantity prompt method and device for a terminal, and the terminal. The method comprises: determining a current electric quantity of the terminal; according to the current electric quantity of the terminal and pre-stored information about a consumed electric quantity to be consumed within a pre-set electricity use period, judging whether the current electric quantity of the terminal can support the consumed electric quantity to be consumed within the pre-set electricity use period; if the current electric quantity of the terminal cannot support the consumed electric quantity to be consumed within the pre-set electricity use period, generating prompt information to prompt a user to perform charging. Thus, the terminal can determine whether the electric quantity of the terminal can support some electric quantities to be consumed within electricity use time required by the user. For example, if the user needs to use the terminal frequently or with high loads, when determining that the current electric quantity of the terminal cannot support the consumed electric quantity to be consumed within the pre-set electricity use period, the terminal can generate the prompt information, so as to give, to the user, a prompt that the current electric quantity of the terminal cannot support the consumed electric quantity to be consumed within the pre-set electricity use period, and to further prompt the user to perform timely charging.