The invention discloses an extension socket with a timing function. The extension socket with the timing function comprises an outer shell, a socket, a power switch, a power line, a built-in guide line and a main control circuit, wherein a timer device is additionally arranged on an extension socket body and is composed of a timing switch, a counter, a comparer, a timing coil, a chip and an on-off circuit, and the timer device can control on-off of the main control circuit of the extension socket. The extension socket with the timing function is reasonable in structural design, the timer device additionally arranged in the extension socket body can enable the extension socket to control electronic products communicated with the extension socket in a timing mode, and functions of the extension socket are enriched effectively; meanwhile, the extension socket is moderate in manufacturing cost and wide in application range, and is regarded as an energy conservation and environment protection product.