A lens module is provided, including a top wall with a light through hole and a barrel wall bent and extending from an edge of the top wall. The lens group includes a special-shaped lens which includes a side surface connecting an object side surface and an image side surface. The side surface includes a first abutting surface connected to the object side surface, and the first abutting surface is arranged at an included angle with an optical axis. The barrel wall includes an inner surface close to the optical axis, and the inner surface includes a second abutting surface arranged opposite to and parallel to the first abutting surface. A distance H between the first abutting surface and the second abutting surface is satisfied: 0 μm