Backlight module, manufacturing method thereof and display equipment

The invention discloses a backlight module and a manufacturing method thereof and display equipment, the backlight module comprises a light source, a diffusion plate and an optical film layer, the light source comprises a substrate and a plurality of lamp beads, the lamp beads are arranged on the substrate, the lamp beads comprise a first light-emitting chip, a second light-emitting chip and a third light-emitting chip, and the first light-emitting chip, the second light-emitting chip and the third light-emitting chip are arranged on the substrate. The first light-emitting chip, the second light-emitting chip and the third light-emitting chip are respectively used for emitting red light, blue light and green light; the diffusion plate is located on the side, provided with the lamp beads, of the substrate. The optical film layer is arranged between the diffusion plate and the substrate, and the refractive index of the optical film layer is larger than that of the diffusion plate, so that the optical film layer