LED chip cutting method and LED chip manufactured by same

The invention discloses an LED chip cutting method on the basis of side-wall corrosion. The LED chip cutting method includes that an LED wafer is subjected to front laser scribing and side-wall corrosion and then is manufactured to form a chip according to a normal LED chip manufacturing process; back laser hidden cutting is carried out after the wafer is subjected to thinning and back plating, and positioning of hidden cutting lines is controlled, so that the hidden cutting lines are staggered from front scribing lines; and an oblique fracture surface is formed on each side wall of a crystal grain under the induction action of stress during fracturing, lateral light emergence is facilitated, the integral luminous flux of the chip is increased, and the appearance and the electric performance of the chip are unaffected. The invention further discloses the LED chip manufactured by the LED chip cutting method. Edges of the LED chip are in the shape of 'Z'-shaped sections with the oblique fracture surfaces. The 'Z'-shaped sections are manufactured by means of laser hidden cutting after the GaN wafer which is a semiconductor substrate is subjected to a chip side-wall corrosion process, accordingly, quantities of emergent light on the side walls are increased, and the brightness of the integral LED chip is improved.