Abstract: This invention relates to a multifunctional paintball gun barrel plug structure, comprising: a barrel plug, wherein the body of the barrel plug is equipped with bores at its axial and radial sides, with a plug included at the body end and having at least an O-ring slot at the upper ring of the plug, and also a nozzle is included next to the plug, in which a connecting channel exists between the nozzle and the bore on the radial side of the body; an optional tobacco pipe which is installable to the body and equipped with a chamber, wherein a stud beneath the tobacco pipe and within the radial side bore connects the chamber and bore; an optional tobacco can at the axial side of the body comprising a lower base, a cover, and an O-ring, which the O-ring is between the lower base and cover above, and the cover end equipped with a stud corresponding to the bore at the axial side of the barrel plug; an optional flashlight at the axial or radial side of the body, which includes a lamp holder and base, wherein the fla