Mercury argon wavelength light source

The utility model discloses a mercury argon wavelength light source which comprises a shell, a circuit board arranged in the shell and a mercury argon lamp electrically connected with the circuit board, an optical filter, a plano-convex lens and an optical fiber interface are sequentially arranged on a light path of the mercury argon lamp, a mounting seat for fixing the mercury argon lamp is further arranged in the shell, and a first through hole is formed in the mounting seat in the light path direction of the mercury argon lamp. The mounting seat can accommodate at least one part of a light-emitting part of the mercury argon lamp, and an optical filter fixing seat for fixing an optical filter is detachably arranged on the mounting seat. According to the utility model, the mercury argon lamp bulb is adopted to emit light, the light is attenuated by the optical filter and then is coupled to the optical fiber interface through the plano-convex lens optical path, so that the light source with the wavelength ran