The utility model discloses an angle adjustable bicycle auxiliary handle seat protection group structure which comprises a base, an angle positioning part, an angle adjusting part and a fixation part. The base is used for being connected to a bicycle auxiliary handle. The angle positioning part is provided with a base fixation surface and an arc fixation surface. The base fixing surface is used for being fixed on the base. The angle adjusting part is provided with an angle adjusting surface and an arc contact surface. Angle adjusting surface is used for allowing the angle adjusting part and the arc fixation surface to relatively move to a leaning angle. The fixation part is used for fixing the angle adjusting surface of the angle adjusting part on the arc fixation surface. The arc contact surface is located at the leaning angle, and the arms of a rider can comfortably lean on the arc contact surface. According to the utility model, the angle adjustable bicycle auxiliary handle base protection group structure has the functions of angle adjusting, horizontal movement and the like.