The invention relates to a cutting device for manufacturing of LED (light emitting diode) kits and an LED kit automatic assembly machine. The cutting device comprises a bracket, a material vibration mechanism, a material shifting mechanism, a cutting mechanism, a material fetching mechanism and a waste box, wherein the bracket is arranged on a worktable, the material vibration mechanism is arranged on the bracket, the material shifting mechanism is arranged at one side, near the material vibration mechanism, of the bracket, the cutting mechanism is arranged on the bracket and is arranged near the material vibration mechanism, the material fetching mechanism is arranged on the bracket and is arranged near the cutting mechanism, and an opening of the waste box faces the cutting mechanism. The cutting device for manufacturing of the LED kits has the advantages that only an LED lamp is arranged in a material vibration cylinder by an operator, then the LED lamp in the material vibration cylinder is arranged on a material vibration plate, and one part of pins of the LED lamp can be cut off; compared with the traditional manual operation method, the production efficiency is higher, and the product quality is also higher.