The invention discloses an auxiliary roller-skating crutch. The auxiliary roller-skating crutch comprises a suction cup, a support rod main tube, a support rod auxiliary tube and a handle, wherein a plastic outer cover is arranged on the outer surface of the suction cup, a support rod length adjusting hole is formed in the support rod main tube, steel balls are formed in the support rod length adjusting hole, a connecting shaft is connected to one side of the support rod auxiliary tube, a sponge anti-slip ring is arranged on the outer surface of the handle, and the handle is located on one side of the connecting shaft, a fixing bolt is arranged on the lower surface of the sponge anti-slip ring, a clamping buckle is arranged on one side, close to a binding strap, of the fixing bolt, and a screw is arranged inside the fixing bolt. Compared with the prior art, the sponge anti-slip ring is arranged on the outer surface of the handle on the basis that the handle is arranged on the existingauxiliary roller-skating crutch, so that a user is not uncomfortable for holding the handle in hand for a long time, the binding strap is arranged below the handle, and wound around the wrist before the roller skating, and therefore, the auxiliary roller-skating crutch does not slip while the roller-skating speed is too high.