The invention belongs to the technical field of inorganic nonmetal and discloses a method for preparing ceramic-base composite material reinforced and toughened by silicon carbide whiskers. The methodincludes the steps of (1), preparing a dispersing solution by blending silicon carbide whiskers, dispersion medium and dispersing agent, filtering the dispersing solution, and drying silicon carbidewhiskers; (2) sieving; (3), mixing ceramic powder, binder and silicon carbide whiskers; (4), molding through an SLS molding machine; (5) subjecting ceramic blanks to isostatic cold pressing treatment;(6) placing the ceramic blanks in a discharge furnace to carry out ungrease treatment; (7), placing the ceramic blanks in an atmosphere furnace to carry out sintering, so as to obtain the ceramic-base composite material reinforced and toughened by silicon carbide whiskers. According to the method, innovative application of the conventional reinforcing and toughening method to the rapid molding field is achieved; besides, bending strength and fracture toughness of ceramic parts at room temperature are increased by at least 30% and 15% respectively as compared with those without silicon carbidewhiskers.