The invention discloses an indexing slotter, which comprises a slotter body (2), a milling device (5), a sliding work platform (3) and a control device (4), wherein, the slotter body (2) is arranged in a slotter base (1), the milling device (5) is fixed on the slotter body (2) that is provided with a guide rail (21), the sliding work platform (3) is arranged on the guide rail (21) and can reciprocate along the guide rail (21), and the control device (4) is used for controlling the milling device (5) and the sliding work platform (3) to work coordinately. The indexing slotter is characterized in that the sliding work platform (3) is provided with a rotary table (6) for fixing a work piece to be processed, the rotary table (6) is provided with a structure for fixing the work piece when the work piece is processed by the milling device (5), and the rotary table (6) is horizontally-rotatably linked with an output shaft of a rotary motor which is fixed on the sliding work platform (3) by a transmission device. Compared with the prior art, the indexing slotter has the advantages of easy installation of the work piece, more accurate control of center distance and high processing accuracy.