Disclosed is a plug-combined pile manufacturing appliance, comprising a concave V-shaped head drilling machine and a square drilling machine. A plurality of concrete square piles are manufactured; when the concrete strength of the square piles reaches a constant value, two cemented soil concave V-shaped head piles are manufactured at the left and right sides of each square pile by the concave V-shaped head drilling machine according to the work mode of the concave V-shaped head drilling machine to enable concave V-shaped surfaces of cemented soil concave V-shaped head piles at the left and right sides of each concrete square pile to fit to the convex V-shaped surfaces at the left and right parts of the concrete square pile, thereby forming a plurality of combined piles fabricated by the mutual combination of the cemented soil concave V-shaped head piles and the concrete square piles. The combined piles are used for the reinforcement treatment of soft foundations.