A connecting structure of support rods of a bedstead is disclosed. The bedstead includes a bed frame. The bed frame includes support rods arranged and connected between two lateral frame rods. The two lateral frame rods each have a plurality of slots. A positioning block is insertedly connected to each slot. The positioning block includes a positioning groove block. The positioning groove block has first positioning portions therein. Two sides of either end of each support rod are formed with positioning openings for the first positioning portions to be engaged therein. The support rods are easily and quickly connected to the bed frame, and the connection and support is stable.