A method for detecting device power, comprising: detecting, by a monitoring terminal, power information of a monitored device; setting a monitoring time interval according to the power information and a preset time interval; detecting the power information of the monitored device according to the monitoring time interval; and wherein the detecting, by the monitoring terminal, power information of a monitored device comprises: detecting, by the monitoring terminal, power information of the monitored device at two consecutive times; and the setting a monitoring time interval according to the power information and a preset time interval comprises: calculating a power decline rate of the monitored device according to the power information detected at the two consecutive times and the preset time interval; and if the power decline rate of the monitored device is less than a preset power decline rate, setting the monitoring time interval to be greater than the duration of the preset time interval; or if the power decline rate of the monitored device is greater than a preset power decline rate, setting the monitoring time interval to be less than the duration of the preset time interval. detecting, by a monitoring terminal, power information of a monitored device; setting a monitoring time interval according to the power information and a preset time interval; detecting the power information of the monitored device according to the monitoring time interval; and wherein the detecting, by the monitoring terminal, power information of a monitored device comprises: detecting, by the monitoring terminal, power information of the monitored device at two consecutive times; and the setting a monitoring time interval according to the power information and a preset time interval comprises: calculating a power decline rate of the monitored device according to the power information detected at the two consecutive times and the preset time interval; and if the power decline rate of the monitored device is less than a preset power decline rate, setting the monitoring time interval to be greater than the duration of the preset time interval; or if the power decline rate of the monitored device is greater than a preset power decline rate, setting the monitoring time interval to be less than the duration of the preset time interval. detecting, by the monitoring terminal, power information of the monitored device at two consecutive times; and the setting a monitoring time interval according to the power information and a preset time interval comprises: calculating a power decline rate of the monitored device according to the power information detected at the two consecutive times and the preset time interval; and if the power decline rate of the monitored device is less than a preset power decline rate, setting the monitoring time interval to be greater than the duration of the preset time interval; or if the power decline rate of the monitored device is greater than a preset power decline rate, setting the monitoring time interval to be less than the duration of the preset time interval. calculating a power decline rate of the monitored device according to the power information detected at the two consecutive times and the preset time interval; and if the power decline rate of the monitored device is less than a preset power decline rate, setting the monitoring time interval to be greater than the duration of the preset time interval; or if the power decline rate of the monitored device is greater than a preset power decline rate, setting the monitoring time interval to be less than the duration of the preset time interval.