The utility model relates to a
waste oil thermal
cracking device, which belongs to the technical field of
waste oil thermal
cracking devices, and comprises a jacket main body, the outer side wall of the jacket main body is provided with a sliding chute, the jacket main body is slidably connected with a sliding block through the sliding chute, the outer side wall of the sliding block is fixedly connected with a
moving frame, and the inner side wall of the
moving frame is rotatably connected with a connecting rod; the end, away from the
moving frame, of the connecting rod is slidably connected with a moving block, the outer side wall of the moving block is rotatably connected with a
threaded rod, and the outer side wall of the
threaded rod is in threaded connection with a threaded sleeve. Through cooperative use of the sliding grooves, the moving frames, the connecting rods, the moving blocks, the threaded rods, the threaded sleeves and the sliding blocks, the outer side wall of the jacket body can be conveniently supported, so that excessive pressure in equipment is avoided, the pressure borne by the outer side wall of the jacket body is effectively dispersed and relieved, meanwhile, the supporting force can be finely adjusted so as to meet the requirements under different pressure conditions, and the practicability is high. The jacket main body is kept in the original form when bearing pressure, and deformation caused by overlarge pressure is prevented.