The invention discloses a preparation method of a deformer. The method comprises the following steps: polymerizing glycerin into polyglycerol with the average polymerization degree of 2 to 15 under the effect of a catalyst; carrying out ring opening polymerizing reaction among polyglycerol, propylene oxide and epoxy ethane to get polyglycerol polyalkoxy ether; and conducting esterification reaction between polyglycerol polyalkoxy ether and C12 to C22 fatty acid to get the deformer. The preparation method is easy to operate and has low cost; and the deformer produced by using the method has excellent deforming effect and can be widely applied into use.