Method for machining cylindrical mirror

The invention discloses a method for machining a cylindrical mirror. The method for machining the cylindrical mirror comprise the steps that a blank is obtained, and the reference surface of the blank is milled; the blank adheres to a tool with wax; the tool with the blank is arranged on a workpiece shaft of a milling device, and the reference surface of the blank is measured with a dial indicator and is clamped; programmed milling is conducted on the cylindrical surface to be machined; the surface type data of the machined cylindrical surface are measured; the surface type data are compared, if the Rt value is larger than 1 micron, correction milling is conducted, and if the Rt value is smaller than 1 micron, polishing is conducted; if the Rt value and the Ra value of the machined cylindrical surface of the polished workpiece meet expected requirements, the workpiece is detached from the tool, cleaning is conducted, and then the cylindrical mirror is obtained. By the adoption of the method for machining the cylindrical mirror, the machining efficiency and the machining precision of the cylindrical mirror are improved, the high-precision cylindrical mirror can be machined, the machining difficulty and the detection difficulty are effectively lowered, generation of waste is avoided, the machining rejection rate is reduced, the technologies are simple, operation is convenient, and good application prospect is achieved.