A light guide structure (10), a backlight module (20) and a display device are disclosed, which can reduce loss of light in travelling and increase utilization rate of light. The light guide structure (10) including: a light guide plate (1) including a light-exiting surface (11) and a reflection surface (12) that are opposite to each other and a side surface (13) connecting the light-exiting surface (11) with the reflection surface (12), a material of the light guide plate (1) being an isotropic material; a reflection type brightness enhancement film (2) that is disposed at a side where the light-exiting surface (11) of the light guide plate (1) is located; a quarter wavelength plate (3) that is disposed between the light-exiting surface (11) of the light guide plate (1) and the reflection type brightness enhancement film (2), with an angle of 45 degree existing between a slow axis of the quarter wavelength plate (3) and a transmission axis of the reflection type brightness enhancement film (2); and a reflect
