Telescopic accurate positioning clamp crossing stroke limit of spark machine and spark machine

The utility model discloses a telescopic accurate positioning clamp crossing the stroke limit of a spark machine. The precise positioning device comprises a precise positioning base assembly and a telescopic cantilever assembly which are mounted on a machine tool spindle, a machining electrode used for part characteristic electric spark finish machining is installed at one end of the telescopic cantilever assembly, the extending length of the telescopic cantilever assembly is correspondingly adjusted according to the length exceeding the stroke in the machine tool machining process, and therefore part integral machining is completed. The utility model further discloses a spark machine which comprises a machine tool body, and the telescopic accurate positioning clamp crossing the stroke limit of the spark machine is installed on a main shaft of the machine tool body. Large-scale over-travel die parts can be machined by a small machine table and are not limited by hard conditions of travel any more; the length