Quick assembly bicycle inner tube

The invention concerns an inner tube that can be quickly installed, which comprises a long strip-like hollow cylindrical body (1) with a valve (2) fixed on it, a convex type end cap fixed to one end of the hollow cylindrical body and a concave type end cap fixed to its other end; the main body of both the convex type end cap and of the concave type end cap comprises an annular cup body and a closed cup bottom; an inner recessed central sinkhole (51) is arranged on an end face of the closed cup bottom of the concave type end cap; a positioning plug (41) is arranged on an end face of the closed cup bottom of the convex type end cap; in use, the positioning plug (41) is tightly inserted in the centrally arranged sinkhole (51) that is recessed towards the inside.