The utility model relates to a horizontal connection rod spare of adjustable length, include: the connecting sleeve has relative first end and second end, first screw rod, one end with the first end spiral shell of connecting sleeve closes the connection, and the other end is equipped with rotatable connecting piece, and the second screw rod, one end with the second end spiral shell of connecting sleeve closes the connection, and the other end is equipped with rotatable connecting piece. The adoption sets up rotatable connecting piece at the tip of first screw rod and second screw rod for the connecting piece freedom of passage is rotated and can be resumeed the normal position, has solved the problem of connecting the difficulty among the prior art. First screw rod and second screw rod close the regulation that realizes length through the spiral shell, and application scope is wide.