The invention provides a timing device, comprising a base, a main timer and a first timer; wherein the main timer is used for displaying hour and minute and provided with a driving unit and a first signal sending unit; the driving unit is combined with the base; the first signal sending unit is controlled by the driving unit; when the main timer clocks for 24 hours, the driving unit controls the first signal sending unit to send a first driving signal; and the first driving signal is sent to the first timer and drives the displayed time of the first timer to be increased by one day. As the first signal sending unit adopts an electronic driving signal transmission mode, the main timer and the first timer need no gears to link, thus leading the size and space design of the timing device to be allocated freely and effectively shortening the testing time.