The invention discloses an extruding tool, which includes an extruding die support and a shear, one end of the extruding die support, close to the shear, is equipped with an inclined surface inclining relative to the shear, and an angle is formed between the inclined surface and an end surface of one end close to the shear; and a connection between a guide rod and a blade of the shear is providedwith an adjusting gasket. Defective materials are cut under regulation of the adjusting gasket of the shear and the inclined surface of the extruding die support, no defective material is remained onthe end surface of the die, in the cutting process of the defective material, for the reason of regulation of the adjusting gasket of the shear and the inclined surface of the extruding die support and change of cutting positions, gaps and size generated by some mechanism design and attrition of the extruder are eliminated, and no defective material is remained on the end surface of the extrudingdie in the cutting process. The extruding die cannot be blocked, products are prevented from being discarded, an extruding cylinder can be tightly locked to avoid generation of 'big cap', and the shear is prevented from being locked by the residual defective materials. The invention also discloses an extruder using the extruding tool.