The present invention relates to a flexible shaft and cutting motor assembling structure and a coal cutter comprising the same, and belongs to the technical field of mining equipment. The assembling structure comprises a flexible shaft and a cutting motor, wherein a sleeve cup and an end cover are arranged at one end of the flexible shaft; the longitudinal sections of the sleeve cup and the end cover are convex; the end cover is positioned at the wide end of the sleeve cup; the wide end of the end cover is in clearance fit with the inner wall of the sleeve cup; the narrow end of the end cover is positioned in the sleeve cup; a groove is formed in the narrow end of the end cover; the wide end of the sleeve cup is connected with the cutting motor; one end of the flexible shaft is embedded into the groove, and the other end of the flexible shaft is connected with a rotor of the cutting motor. The present invention provides a novel matching manner of the cutting motor and the flexible shaft; after being cut to be broken, the flexible shaft can be drawn out entirety, so that the operation is fast, a new product can be changed fast, the changing time is saved, and the economic benefit is high; in additional, during the processes of entire removal and installation of the flexible shaft, only one tool is needed.