The invention provides a guide unit for 3D printing for dental implant and integral reconstruction of the lower jawbone. The guide unit comprises a bone graft guide plate, a base with dental implant guide holes, a first lower jawbone fixing plate and a second lower jawbone fixing plate. A guide track of the bone graft guide plate and an extending track of the bone graft are consistent in matching. The bone graft guide plate is provided with a plurality of bone graft fixing holes used for connection of the bone graft. The base with dental implant guide holes is arranged on the upper side of the bone graft guide plate, openings of the dental implant guide holes are opposite to the bone graft. The first lower jawbone fixing plate and the second lower jawbone fixing plate are respectively connected to two ends of the bone graft guide plate, are provided with internal side surfaces fitting the surfaces of the corresponding lower jawbone, and are provided with a plurality of lower jawbone fixing holes used for connection of the lower jawbone. With application of the guide unit, lower jawbone reconstruction operation is guided by the bone graft guide plate, while part of operations for dental implanting, such as preparation of implant holes and implanting of implants, are assisted by the bone graft guide plate, and accordingly operation accuracy and success rate are both increased greatly.