The invention provides a multifunctional crusher belonging to the technical field of cutting equipment. According to the crusher provided by the invention, a movable fluted disc and a crushing part installed on the movable fluted disc are improved to enlarge a crushing chamber and increase a cutting and crushing space, and all round teeth, square teeth and flat teeth uniformly distributed on the movable fluted disc are changed to blades which are uniformly distributed at intervals so as to arrange a relatively large quantity of cutting parts in the relatively large cutting space, so that the crushing demands on crop straws and particle materials are satisfied, and the problems that the blockage is easily caused, the power load is increased, the yield is low, the cost is high, the efficiency is low, and the like in an existing crusher can be solved. A same crusher can crush particles and long fiber materials just by changing an externally connected feeding mechanism by arranging a feeding device with a detachable replaceable structure, so that the multipurpose functions is realized.