An automatic shut off apparatus for an electronic device includes an input circuit, a timing circuit, a control circuit, and a switch circuit. The input circuit is to receive a designated power-off time delay for the electronic device. The control circuit is to receive the designated power-off time delay from the input circuit, and output a control signal. The timing circuit is to time according to the control signal, and output an instruction signal in response to designated power-off time being reached. The switch circuit is to shut off power of the electronic device according to the instruction signal.