An adjusting and fixing device for splicing a rolling seeder onto a dry land plow comprises an adjusting rod, a fixing clip and a fixing screw rod, wherein one end of the adjusting rod is sleeved with a main adjusting pipe, a main adjusting and fixing screw rod is arranged on the main adjusting pipe, and a rolling seeder push rod fixing groove rod is fixed on the main adjusting pipe; the other end of the adjusting rod is sleeved with an auxiliary adjusting pipe, an auxiliary adjusting and fixing screw rod is arranged on the auxiliary adjusting pipe, and a push rod upper fixing groove is formed on the auxiliary adjusting pipe; and a connecting plate, a movable connecting plate and an adjusting and fixing bolt are fixed at the lower end of the rolling seeder push rod fixing groove rod, and a push rod lower fixing groove is fixed at the end of the movable connecting plate. The universal rolling seeder can be spliced onto the dry land plow, while one person operates the dry land plow to plough, sowing is performed in a position with a certain distance to the dry land plow, and one person can accomplish two person's work. The adjusting and fixing device has the advantages of simple structure, low cost, convenience in implementation and the like, is convenient to operate, can sow while ridging, saves labor and time, has an excellent moisture keeping effect, improves the emergence rate and the orderliness of sowing, and has a wide range of application.