LED chip and preparation method thereof

The invention provides an LED chip and a preparation method thereof, the LED chip comprises an LED epitaxial layer, electrodes arranged on the epitaxial layer, and a passivation layer arranged on the LED epitaxial layer and covering the electrodes, the electrodes comprise a P-type electrode and an N-type electrode, the passivation layer is provided with a groove, and the P-type electrode and the N-type electrode are arranged in the groove. The P-type electrode and the N-type electrode are at least partially exposed through the groove; the passivation layer comprises a first passivation sub-layer and a second passivation sub-layer arranged on the first passivation sub-layer, and the second passivation sub-layer is provided with a groove or a hole at a position between the P-type electrode and the N-type electrode. According to the LED chip, the electrodes are protected through the first passivation sub-layer and the second passivation sub-layer, the distance between the two electrodes is prolonged through the