The invention belongs to the technical field of planting devices, and especially relates to a planting device for fruit trees. In the prior art, a hole digging device has simple design, holes of different widths cannot be formed according to the size of fruit seedlings in the digging process, and the problems of a poor planting effect and low survival rate of the fruit trees are caused. The proposed scheme includes a top plate, wherein a fixing groove is fixed on the outer wall of the bottom of the top plate through screws, an electric push rod is arranged on the inner wall of the fixing groove, and a mounting block is fixed to one end of the piston rod of the electric push rod through screws; and a mounting groove is formed in the outer wall of the bottom of the mounting block, a motor isarranged on the inner wall of the mounting groove, and the output shaft of the motor is connected with a fixed box through a coupling. The extended length of a drill tooth can be adjusted, holes of different widths can be formed in the digging process, therefore, planting needs of the seedlings of different size can be met with a good planting effect, and the survival rate of the planted fruit seedlings is improved.