The invention belongs to the technical field of pit digging equipment, and particularly relates to an integrated pit digging machine for seedling planting. The integrated pit digging machine comprises an excavator bucket, a fixing frame, a first rotating shaft, a first gear, a first worm wheel, a first worm, a supporting base, a second gear, a third gear, a first motor, a supporting frame, an electric push rod, a baffle, a lifting frame, a lead screw, a second worm wheel, a second worm, a second motor and a tractor. By controlling cooperation of the first motor, the second motor, the electric push rod and the third motor, opening and closing of the excavator bucket are controlled, ascending and descending of the excavator bucket, ascending and descending of the baffle and shaking of the baffle are controlled, and then pit digging, seedling placing and soil backfilling of the pit digging machine are achieved; and therefore, semi-automation or automation of seedling planting is achieved, the seedling planting time is shortened, the seedling planting speed is increased, and meanwhile the labor intensity of workers during seedling planting is relieved.