A crystal bar slicer, comprising a frame body, a cutting shaft and a holding mechanism, wherein the frame body is provided with a slicing chamber and a feeding channel, the slicing chamber is in front of the feeding channel, a rear sidewall of the slicing chamber is provided with a feeding port, a rear end of the feeding channel is in communication with outside of the frame body, a front end of the feeding channel is in communication with the slicing chamber via the feeding port, a crystal holder is capable of entering the slicing chamber through the feeding channel, the cutting shaft is disposed in the slicing chamber, the holding mechanism is configured to drive the crystal holder to move towards or away from the cutting shaft.