The utility model discloses an illumination circuit with a timer, which comprises a power supply and an illumination lamp. The timer is arranged in the illumination circuit for controlling the timing on-off of the illumination lamp. The illumination circuit further comprises a contactor the switch of which is connected with the illumination lamp in series. The coil of the contactor is controlled by the switch of the timer. The utility model does not need manual management on the illumination lamp. The on-off of the illumination lamp is controlled through uniform timing and electric quantity waste is prevented.