The invention mainly relates to the technical field of a batch mill in mechanical processing, and discloses a flexible rail batch mill. The flexible rail batch mill is mainly composed of a housing, a double ended machine, a flexible rail guide rail, a rail rack, an electromagnetic coil, a permanent magnet bar, a rail sliding block, a grinding wheel, a grinding wheel drive motor and a drive gear. The flexible rail batch mill is characterized in that electromagnetic force is generated by an electromagnetic coil in the flexible rail batch mill so that the flexible rail guide rail is fixed on the surface of a workroom by virtue of electromagnetic force, and the drive gear is driven by the double ended machine so as to drive the flexible rail guide rail to move, therefore the surface of the special workroom can be ground, and the dynamics of the grinding wheel pressed on the surface of a work-piece can be controlled by a direct-acting electromagnet; furthermore, the flexible rail batch mill is applicable to the complicate grinding operation of the surface of a ferromagnetic work-piece, and the automatic batch grinding operation can be realized to a certain degree; furthermore, the flexible rail batch mill has the advantages of simple structure, low manufacturing cost and strong adaptability.