The invention discloses an optical module and belongs to the field of optical communication. The optical module provided by the embodiment of the invention includes: a circuit board and a lens assembly, and a first light emitting chip, a second light emitting chip, a first light monitoring chip and a second light monitoring chip, which are arranged between the circuit board and the lens assembly and mounted on the surface of the circuit board. The lens assembly is provided with a first reflection surface and the same-side edges of the first reflection surface are provided with a second reflection surface and a third reflection surface. The first reflection surface and the second reflection surface reflect light from the first light emitting chip in different directions and the first reflection surface and the third reflection surface reflect light from the second light emitting chip in different directions; the first light monitoring chip receives light from the second reflection surface and the second light monitoring chip receives light from the third reflection surface. Light split monitoring is realized and the number of arranged light emitting chips is increased.