The invention relates to a solvate-free and crystal water-free crystal form of 4-accetoxy-2alpha-benzoyloxy-5beta,20-epoxy-1-hydroxy-7beta,10beta-dimethoxy-9-oxotax-11-en-13alpha-yl(2R,3S)-3tert-butoxycarbonylamino-2-hydroxy-3-phenylpropanoate 1-hydroxy-7beta,10beta-dimethoxy-9-oxo-5beta,20-epoxytax-11-ene-2alpha,4,13alpha-triyl4-acetate 2-benzoate13-[(2R,3S)-3-{[(tertbutoxycarbonyl]amino}-2-hydroxy-3-phenylpropanoate. A powder X-ray diffraction (PXRD) diagram shows that the crystal is positioned on the characteristic peaks of 4.3, 7.4, 8.6, 10.0, 11.0, 12.2, 12.6, 13.3, 13.6, 14.2, 15.0, 15.5, 16.4, 17.0, 18.1, 18.6, 20.2, 21.0, 21.6, 22.1, 22.8, 24.0, 24.6, 25.3, 25.8, 26.9, 28.0, 29.4, 31.5, 32.0, 34.4, 35.5, 36.8 and 41.7 DEG 2theta. The invention also discloses a preparation method for the crystal. The crystal prepared under reduced pressure at room temperature is high in yield and purity, and does not have any solvent residue.