A trigger reset device contains: a trigger seat, a drive element, a button, and an engagement switch. The trigger seat includes a channel, a string hook, a movable safety switch movably switched between an opening position and a closing position. The trigger seat includes a connection trigger, a receiving groove and a coupling trench, and the receiving groove has a lifting means. The drive element includes a slot and a controlled unit. The button includes a slidable sleeve portion. The engagement switch is rotatably accommodated in the coupling trench and includes a locating portion and a fifth spring defined between the engagement switch and the trigger seat, hence the spring abuts against the engagement switch so that the drive element is stopped by the locating portion of the engagement switch in the normal state and the button does not move to actuate the drive element to move.