The invention belongs to the technical field of medicine and discloses a tofacitinib crystal form compound and a preparation method thereof. The X-ray powder diffraction spectrum shown by the 2 theta +-0.2 degree diffraction angle shows characteristic diffraction peaks at 2.42 degrees, 3.25 degrees, 4.23 degrees, 5.04 degrees, 6.12 degrees, 7.08 degrees, 8.02 degrees, 9.72 degrees, 10.63 degrees, 12.90 degrees, 14.35 degrees, 15.71 degrees, 17.82 degrees, 18.34 degrees, 19.24 degrees, 22.46 degrees, 24.56 degrees, 26.62 degrees, 30.75 degrees and 32.45 degrees, and the X-ray powder diffraction spectrum obtained by Cu-K alpha ray measurement and shown by the figure I is totally different from the prior art. The tofacitinib crystal form compound has better water solubility and high stability, the preparation method is simple and easy to operate, the medication safety is improved greatly after the compound is prepared into a drug composition, and the compound is very suitable for clinical application.