The invention discloses a near-zero OD backlight module and a Mini LED lamp bead manufacturing method thereof. The backlight module comprises a PCB, lens machining adsorption holes, Mini LED lamp beads, reflection paper, a diffusion sheet, a diffusion plate, a quantum dot film, a prismatic lens and a liquid crystal screen. A back plate is arranged on the back of the PCB, and a diffusion sheet, a diffusion plate, a quantum dot film, a prismatic lens and a liquid crystal screen are sequentially arranged above the PCB; each Mini LED lamp bead comprises a Mini LED chip and a lens, the Mini LED chip is welded on an LED chip bonding pad of the PCB, and the lens wraps the Mini LED chip; the top of the lens is directly contacted with the diffusion sheet; the lens is prepared by curing organic silica gel, the viscosity of the organic silica gel is 4000-22000 Pa.s, and the hardness of the cured organic silica gel is Shore D60. The near-zero OD backlight module has the advantages that the thickness of the backlight module is reduced, the process steps are reduced, the production cost is reduced, meanwhile, the productivity is improved, lenses of different structural shapes are formed, modular production is achieved, and the replacement and maintenance cost is reduced.