The present invention discloses an optical module and a production method thereof. The optical module comprises a first optical assembly and a second optical assembly; the first optical assembly includes an optical emitting element and a first lens which are fixed; the middle line of the light outgoing surface of the light emitting element is aligned with the first main optical light of the first lens; the second optical assembly includes a light receiving element and a second lens which are fixed; the center line of the light receiving surface of the light receiving element is aligned with the second main optical axis of the second lens; when the first optical assembly and the second optical assembly are welded, light passes through the first lens and the second lens sequentially and is converged to form a first light spot and a second light spot respectively; and a first distance from the first light spot to the optical center of the second lens is larger than a second distance from the second light point to the optical center of the second lens. According to the optical module provided by the technical schemes of the present invention, a double-lens system is adopted, and welding error is the error of the first optical assembly relative to the second optical assembly; since the first distance is greater than the second distance, produced light spot deviation is smaller than the welding error, and therefore, welding precision requirements can be lowered.