The invention discloses an optical detector trigger and an optical detector with the trigger. The optical detector trigger comprises a trigger switch used for starting optical detection to emit detection light when triggered; a hollow optical axis, through the cavity of which the detection light penetrates to reach a detected object, wherein the hollow optical axis and the trigger switch have fixed relative positions; and a mobile trigger capable of approaching or staying away from the trigger switch relative to the optical axis so as to trigger or reset the trigger switch. The optical detector trigger automatically triggers the detection operation of the optical detector and timely stops the detection operation through the movement of the mobile trigger relative to the trigger switch, thereby increasing the triggering speed and efficiency of the trigger, reducing detection operation complexity, and avoiding loss caused by triggering and reset operation errors.