The invention provides a display with switchable visual angle and a backlight module thereof. The display comprises the backlight module and a display panel. The backlight module comprises a light guide plate, a first optical structure, a reflector plate, a first light source and a second light source. The light guide plate comprises a bottom surface, a light outlet surface, a first light inlet surface and a second light inlet surface, wherein the display panel is arranged on the light outlet surface. The first optical structure is formed on the bottom surface and comprises a first inclined plane and a second inclined plane, wherein the included angle of the first inclined plane and the bottom surface is less than that of the second inclined plane and the bottom surface. The light of the first light source and the second light source respectively enters the light guide plate from the first light inlet surface and the second light inlet surface, then can be reflected by the first inclined plane or the second inclined plane or reflected to the below reflector plate through the first inclined plane or the second inclined plane and then is reflected by the reflector plate to enter thelight guide plate from the first inclined plane and the second inclined plane. The invention achieves the function of switching the visual angle on the basis of the structural design by matching withthe switching control on the first light source and the second light source.