A timed glue gun includes a glue pushing unit including a trigger, a glue pushing member and a heating member for melting the hot melt glue stick, and a control unit including a timing member and an alarm member. The trigger is at a released position, and is operable to be pressed to a triggered position. The timing member starts to count upwards from zero when the heating member starts to heat up, and controls the alarm member to emit a first alarm signal when counting to a first elapsed time. The alarm member emits a second alarm signal when the timing member counts to a second elapsed time longer than the first elapsed time in response to continuous location of the trigger at the released position for the second elapsed time during heating of the heating member.