NOVELTY - Preparation of glyceryl polyether polylol comprises (1) adding biodiesel byproduct crude glycerine into refining device, heating up, vacuum-pumping, adding adsorbent, stirring, absorbing organic salt crystal impurities, filtering to obtain refined glycerine; (2) adding the refined glycerine, other low-molecular-weight polylol and amine compound as initiator into a reactor; (3) adding catalyst into above reactor; (4) adding oxyalkylene, keeping pressure and substantially reacting; and (5) degassing and filtering above reaction product to obtain glyceryl polyether polylol.    USE - The process is useful for preparing glyceryl polyether polylol (claimed).    ADVANTAGE - Preparation of glyceryl polyether polylol takes crude glycerine produced by biodiesel as material to produce glycol and has low cost. The product has excellent performance and can satisfy requirement of producing polyurethane material.    DETAILED DESCRIPTION - Preparation of glyceryl polyether polylol comprises (1) adding biodiesel byproduct crude glycerine into a refining device, heating up, controlling the temperature at 110-130 degrees C, vacuum-pumping for 3-6 hours, adding adsorbent, stirring for 1-3 hours, absorbing organic salt crystal impurities, filtering to obtain refined glycerine; (2) adding the refined glycerine, other low-molecular-weight polylol and amine compound as initiator into a reactor, where the weight proportion are 5-100% of refined glycerine, 0-95% of polylol and 0-40% of amine compound; (3) adding catalyst into above reactor, the amount of the added catalyst is 0.2-10% of the weight of the initiator; (4) adding oxyalkylene, whose weight is 2-10-fold of that of the initiator, into above reactor at 90-155 degrees C, keeping pressure at 0.05-0.6 MPa, and substantially reacting; and (5) degassing and filtering above reaction product to obtain glyceryl polyether polylol; where refined glycerine is obtained by refining crude glycerine produced by biodiesel; polyether glycol is obtained by taking the refined glycerine and other low-molecular-weight polylol and amine compound as initiator, or taking the refined glycerine as initiator independently to react with oxyalkylene under the condition that basic catalyst is present.