The invention discloses an optical detector trigger device and an optical detector provided with the trigger device. The optical detector trigger device comprises a trigger switch, a hollow light through shaft and a movable trigger, wherein the trigger switch is used for starting optical detection when being triggered, so that the detection light is emitted; the detection light can pass through an inner cavity of the hollow light through shaft so as to reach an object to be detected; the light through shaft and the trigger switch have fixed relative positions; the movable trigger can move to be close to or far from the trigger switch relative to the light through shaft, so that the trigger switch can be triggered or reset. According to the optical detector trigger device, the detection operation of the optical detector is automatically triggered and is stopped in time by the relative movement between the movable trigger and the trigger switch, so that the trigger speed and the trigger efficiency of the trigger device can be improved, the complexity of the detection operation is reduced, and the loss caused by the error of triggering and reset operation can be avoided.