The utility model relates to a novel harrow assembly of a soil preparation machine, in particular to a harrow assembly of a heavy-duty soil preparation machine, which meets the design requirements for series of products and is convenient for repair and maintenance. The novel harrow assembly mainly comprises a harrow plate, a bearing support arm, a bearing housing assembly, a square shaft, a soil scraping device, a spacer pipe, a harrow assembly cross beam, a press plate and locking nuts. The harrow assembly cross beam comprises 2 to 3 square pipes, the bearing support arm is mounted on the harrow assembly cross beam through the press plate and four bolts, a pair of taper roller bearings with round inner bores are arranged in the bearing housing assembly, and the two ends of the square shaft are fixed through the locking nuts respectively. The novel harrow assembly has the advantages that the parts on the harrow assembly are convenient for mounting, dismounting, repairing and adjusting; the bearing seal and work reliability are improved, the harrow plate number can be increased conveniently, the parts have good universality, and the manufacturing cost is reduced.