A crossbow setting device which assists with efficiently setting a crossbow into an armed position. The crossbow setting device generally includes a platform which includes a receiver aperture leading to a pathway extending inwardly from its front end. A locking member is slidably positioned within the receiver aperture so that it may traverse the pathway. A receiver opening comprised of a pair of slots is formed in an upper surface of the platform tangentially with respect to the pathway. By retracting the locking member, positioning the stirrup of a crossbow through the receiver opening and re-inserting the locking member, the crossbow may be locked into an upright position for use on-the-fly or to aid in setting the crossbow into an armed position.