The invention discloses a linker for auxiliary bicycle handlebars, which comprises a linker body and an adjusting set, wherein the bottom of the linker body is provided with a guide groove, the top surface of the liker body is provided with an adjusting hole, and the adjusting hole is communicated with the guide groove; and the adjusting set comprises two nested seats and two adjusting bolts, wherein the two nested seats are respectively provided with a nested hole, the opposite inner sides of the two nested seats are respectively provided with a protruded guide block, and the guide block is provided with a screw hole, the periphery of a part (connected with the guide block) of the nested hole arranged on each nested seat is provided with a cut groove, the guide blocks oppositely arrangedon the inner sides of the two nested seats are nested in the guide groove arranged at the bottom of the linker body, and the two adjusting bolts after passing through the adjusting hole at the top ofthe linker body are in spin-lock fit with the screw holes on the guide blocks of the nested seats. When the nested holes of the nested seats are respectively nested in the front ends of two parallelly-arranged auxiliary handlebars, the distance between the two auxiliary handlebars can be adjusted, so that a hand holding and resting effect is provided for riders under a stable structure.