Disc opener lifting and seeding power cutting device for grain seeder

The utility model discloses a disc opener lifting device and a seeding power cutting device for a grain seeder, which belongs to agricultural machine; a frame assembly is sequentially provided with a hydraulic oil cylinder, a supporting block and three pairs of square-shaft blocks which are opposite arranged, wherein, the three square shafts are respectively inserted into the three pairs of square-shaft blocks, and the square shaft is fixedly provided with a rotating arm and a hanging plate, and a disc opener assembly is hinged with the hanging plate, meanwhile, both ends of a spring rod for sleeving a pressure spring are respectively connected with the disc opener assembly and the hanging plate, and both ends of a rocking rod which is hinged with the supporting block are respectively connected with the hydraulic oil cylinder and a overall driving rod, a longitudinal tension rod is hinged with three rotating arms, and the overall driving rod is hinged with the rotating arm, in this way, a disc opener lifting