The invention discloses a voice prompting device for a three-minute standby electric appliance. The device is characterized by consisting of a power switch, a
system power, a detection circuit, a time
delay control circuit, a voice circuit, an indicator light, a main control output end and an external electric appliance output end. The
control circuit is simple and mainly controls an electric appliance in an off or standby state, when an output power is less than a set power, voice is generated for prompting according to a required setting standby
delay time, and the prompting voice can be recorded by users. The energy-saving
consciousness of electric appliance users is increased, the users are prompted to
cut off the power, and furthermore, a standby safety problem is solved. The device is particularly suitable for prompting the blind, the old and forgetful men, is suitable for a series of related standby energy-consuming electric appliances such as computers,
multimedia systems, televisions, home audio systems, kitchen appliances and production and living electric appliances, and is used for prompting power
cut-off operation and the like.