The invention relates to a traditional Chinese medicine decoction piece raw material slicing device in the technical field of slicing devices.The traditional Chinese medicine decoction piece raw material slicing device comprises a bottom plate, a supporting plate, a positioning sleeve, a motor, a rotating disc, a tooth block, a lead screw and a gear, when the rotating disc rotates, the gear and the tooth block can be intermittently meshed, and the lead screw is sleeved with a nut block in a threaded mode; a concave positioning groove is formed in the end, facing the positioning sleeve, of the pushing sleeve, and a blade is arranged above the positioning sleeve and driven by a lifting unit to ascend and descend in a reciprocating mode. Through rotation of a motor, a turntable drives a plurality of gear blocks to rotate, when the gear blocks rotate to be engaged with a gear, the gear is driven to rotate, then a lead screw can be driven to rotate for a plurality of circles, when the lead screw rotates, a nut block is driven to move through driving force of thread screwing, and traditional Chinese medicinal materials can be pushed by a pushing sleeve; and the traditional Chinese medicinal materials can move by a fixed stroke in the direction of the blade, so that the slicing thickness of the blade on the traditional Chinese medicinal materials can be consistent, and the slicing precision of the traditional Chinese medicinal materials is improved.