The invention relates to the technical field of rice cake machining, in particular to a segmenting device for rice cake production. The device comprises a fixed plate, the top of the fixed plate is fixedly connected with a motor base, the top of the motor base is fixedly connected with a motor, an output shaft of the motor is fixedly connected with a rotating arm, the front side of the other end of the rotating arm is fixedly connected with a short rod, the outer side of the short rod is rotatably connected with a sliding block, the outer side of the sliding block is in sliding connection withan arc frame, the bottom of the arc frame is fixedly connected with a connecting rod, the bottom of the connecting rod is fixedly connected with a fixed base, the bottom of the fixed base is in sliding connection with a knife holder, and a blade is arranged in the knife holder; the segmenting device is suitable for the rice cake segmenting machining production line, through the sliding block, thearc frame and the rotating arm, the blade is driven to move in an up and down reciprocating manner, the automatic cutting effect is achieved, a blocking plate and the knife holder are arranged, the position of the knife holder is adjusted, the rice cake segmenting length is adjusted, the device is reasonable in structure and high in practicability, the rice cake segmentation length can be adjusted, the automation degree is high, time and labor are saved, production efficiency is high, and use and popularization are facilitated.