The invention provides a crystal cutting device and method, and relates to the technical field of material cutting. The crystal cutting device is characterized in that a worktable, a cutting mechanism, a crystal adjusting mechanism and a crystal orientation detecting mechanism are integrated; the crystal adjusting mechanism comprises a rotating mechanism and a pitching mechanism, the crystal orientation detecting mechanism comprises a moving table, a rotating device, a detecting device and an ampere meter, and the crystal cutting method comprises the steps that the crystal to be cut is fixed to a material disc; through the crystal adjusting mechanism, the space posture of the crystal to be cut is adjusted in the rotating orientation, and the expression of the ampere meter achieves peak value; a detecting device of the crystal orientation detecting mechanism is rotated by 90 degrees, through the crystal adjusting mechanism, the space posture of the crystal to be cut is adjusted in the pitching direction, and expression of the ampere meter achieves peak value; and the crystal adjusting mechanism is locked, and the crystal to be cut is cut. According to the crystal cutting device andmethod, the cut crystal is high in crystal orientation precision, the surface quality is good, and cutting efficiency is high.