The present disclosure discloses an imaging lens assembly including, sequentially from an object side to an image side along an optical axis, a first lens, a second lens, a third lens, a fourth lens and a fifth lens. The first lens has a positive refractive power, and both of an object-side surface and an image-side surface thereof are convex surfaces; the second lens has a negative refractive power, and both of an object-side surface and an image-side surface thereof are concave surfaces; the third lens has a positive refractive power, and an image-side surface thereof is a convex surface; the fourth lens has a negative refractive power, and an image-side surface thereof is a concave surface; and the fifth lens has a positive refractive power or a negative refractive power.