The invention discloses an auxiliary device for a magnetic bearing and relates to a bearing. A wind collecting sleeve matched with aerofoil-shaped blades is further arranged on a shaft; the wind collecting sleeve comprises a wind inlet end and a wind outlet end; the aerofoil-shaped blades are wrapped with the wind inlet end; the wind outlet end extends out of a bearing body through the bearing body; a wind outlet is formed in the wind outlet end; the wind collecting sleeve is provided with a plurality of wind outlet points at one section inside the bearing body uniformly and densely; a sliding sleeve is further arranged inside the wind collecting sleeve slidingly; a wind outlet passage matched with the wind outlet points is formed in the sliding sleeve; accommodating grooves matched with fixed grooves are formed in the wind collecting sleeve; reset springs are arranged in the accommodating grooves; and magnet blocks matched with the fixed grooves are arranged on the reset springs. Compared with the prior art, an airflow jetting device is arranged on the shaft, so that airflow is generated when the shaft rotates; and when the magnetic bearing loses a stable point and loses magnetism, airflow can be enabled to jet into the magnetic bearing, so that the airflow can keep the shaft in a suspension state inside the magnetic bearing.