Invokana crystal form I and preparation method thereof

The invention discloses an invokana crystal form I. An X-ray powder diffraction atlas of the crystal form has characteristic diffraction peaks at the positions where 2 theta values are 4.4+/-0.2 degrees, 8.4+/-0.2 degrees, 16.8+/-0.2 degrees, 17.5+/-0.2 degrees, 18.0+/-0.2 degrees and 22.8+/-0.2 degrees. The crystal form is stable in physicochemical property and suitable for manufacturing of various preparations.