An optical module is provided for covering and being assembled on a light source module and providing light distribution and insulation protection for the light source module. The optical module includes a body comprising an optical portion and a power supply drive accommodating portion. The optical module also includes a mounting portion formed to integrally extend from the body. The optical portion is provided with a plurality of lens units that are formed to integrally project along a first direction from a surface of the body. The power supply drive accommodating portion is provided with an accommodating space formed to integrally extend along the first direction from the surface of the body so as to accommodate the power supply drive. The mounting portion at least partially accommodates a magnetic mounting element that includes a nonmagnetic base and a strong magnet which is connected integrally with the nonmagnetic base.