LED display panel and preparation method thereof

The LED display panel comprises a substrate, a driving layer and a plurality of light-emitting units, the driving layer is arranged on the substrate, a plurality of groups of electrodes are arranged on the driving layer, the group number of the electrodes is the same as the number of the light-emitting units, each group of electrodes comprises a cathode and an anode, two bonding pieces are arranged on each light-emitting unit, and the bonding pieces are arranged on the substrate. The two bonding pieces on the light-emitting unit are bonded with the cathode and the anode of the electrode respectively, the width of the cathode and the width of the anode are larger than the width of the bonding pieces, a cathode groove and an anode groove are formed in the sides, away from the driving layer, of the cathode and the anode respectively, and the two bonding pieces on the light-emitting unit stretch into the cathode groove and the anode groove respectively. And the positive electrode and the negative electrode are re