The invention discloses an air spring for rail transit. The air spring comprises an upper cover plate fixedly connected with a vehicle body and an air bag fixedly connected with the upper cover plate in a sealing mode. The air spring further comprises a sand clock spring assembly connected with the air bag in a sealing mode. The sand clock spring assembly comprises a sand clock spring and a limiting part arranged in the sand clock spring. The limiting part comprises a hard boss extending downwards, the height of the hard boss is smaller than that of the sand clock spring, the perpendicular deformation of the sand clock spring is limited through the height difference of the hard boss and the sand clock spring, and the sum of a blocking gap of the sand clock spring and a space gap is the maximum deflection allowed by a vehicle body relative to a bogie. By means of the air spring for the rail transit, the deflection of the vehicle body can be controlled within a certain range, and the risk that the vehicle body interferes with the bogie when the deflection of the vehicle body is too large is avoided. Meanwhile, the air spring for the rail transit is simple and compact in structure, easy to assemble and small in needed installation space.