A traditional Chinese medicine decoction piece cutting device, comprising a first box body (1) and a second box body (6). The second box body (6) is fixedly connected to a top wall of the first box body (1) by means of a support rod (2). The support rod (2) is slidably connected to a horizontal plate (3) by means of a slide groove (201). A cutter (304) is connected to a bottom portion of the horizontal plate (3). A gear rack (302) is fixedly connected to the bottom portion of the horizontal plate (3). A material-discharge mechanism is connected to an end of the gear rack (302) away from the horizontal plate (3). A lock mechanism corresponding to the material-discharge mechanism is connected to a sidewall of the first box body (1). A cam mechanism is connected onto the second box body (6), and an output end of the cam mechanism abuts the horizontal plate (3). A collection box (101) is disposed inside the first box body (1), and a feed port (102) corresponding to the collection box (101) is disposed at a top portion of the first box body (1).
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