The invention discloses a double-bamboo connection structure for bamboo structure systems. The double-bamboo connection structure comprises a bamboo stem I and a bamboo stem II; the end of the bamboo II perpendicularly intersects with the side of the bamboo stem I; one end, perpendicularly intersecting with the bamboo stem I, of the bamboo stem II is provided with an arc face milled inward and fitting the outer peripheral surface of the bamboo stem I; the joint of the bamboo stem I and the bamboo stem II is provided with a first hole made radially and inwardly; a bolt I is inserted into the first hole; one end of the bolt I is provided with a nut I in screwing fit with the bolt I; the other end of the bolt I extends into the bamboo stem II and provided with a loop by welding; two sides of the bamboo stem II are provided with radial second holes; a fastening bolt II is inserted into the second holes. The double-bamboo connection structure for bamboo structure systems I simple in structure, ingenious in design and convenient to use; the double-bamboo connection structures can be connected stably and reliably; connection strength of connection joints can be improved effectively; tensile resistance of the whole structure is improved; overall earthquake resistance of the bamboo structure system buildings is further improved accordingly; and further popularization of the bamboo structure system buildings is benefited.