A rotating jig for grinder is provided to minimize space and time for installing the block jig by respectively performing a plurality of V- block role with only one rotating jig. A rotating jig for grinder comprises a jig body(200) formed in a surface in the horizontal flat board, a fixture(210), including a penetration hole(230), formed in an upper opposite ends of the jig body in the longitudinal direction, a rotating machine(220), including a plurality of pinholes in the side of cylinder, inserted into the penetration hole of fixture and a block jig(250), mounted on the rotating machine, including a plurality of V- block in a plurality of grooves side.
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