A backlight module and a display device are disclosed, and the backlight module includes: a light source component, a wavelength selection film, and a first light emitting film laminated in sequence. The light source component is configured to emit light of a first wavelength range, the wavelength selection film transmits the light of the first wavelength range and reflect at least light of a second wavelength range, the second wavelength range does not coincide with the first wavelength range, and the first light emitting film is configured to excite and emit blue light under an illumination of the light of the first wavelength range.