The invention relates to an adjustable high-stable F-P integrated endoscope device which comprises a signal source, a high-voltage amplifier, a light source, an optical separator, a reflective plane mirror set, a matching lens and an F-P integrated endoscope set. The high-voltage amplifier and the light source are connected with the signal source. The optical separator and the reflective plane mirror set are sequentially arranged on an emergent light path of the light source. The matching lens and the F-P integrated endoscope set are sequentially arranged on a reflected light path of the reflective plane mirror set. The frequency variations of spectral lines can be greatly reduced, according to the F-P integrated endoscope set, lens mounts for fixing a first plano-concave lens and a second plano-concave lens are fixed in a V-shaped groove in the top of a base, therefore, the free degree of the lens mounts is greatly reduced, the direction of horizontal moving is also limited, and stability and sensitivity and precision of detection of the lens set are greatly improved. The purpose of convenient adjusting is achieved, besides, the requirement for the stability is met, operation is convenient, the structure is simple, and the simple tool is provided for a related physical experiment.