The invention provides a wool spinning compound flocking shell fabric and a preparation method thereof and belongs to the field of textiles. The wool spinning compound flocking shell fabric comprises back cloth, surface cloth and a flocking layer. The back cloth is a knitted double-sided shell fabric, the surface cloth is single-sided cloth of knitted plain weaves, the back cloth and the surface cloth are compounded on the reverse sides, and fluff on the flock layer is fixed on the front surface of the surface cloth by means of electrostatic flocking. At the same time, the invention also provides a preparation method of the wool spinning compound flocking shell fabric. The shell fabric obtained by the invention is stable in dimension, stiff and smooth in hand feel, novel in appearance pattern and high in cost performance, and solves the problems that the flocking shell fabric is easily subjected to fluff falling, fluff reversion, wrinkling and colored light change.