The invention provides a tree mover portal which comprises a bottom frame, a guide rail frame and a front supporting arm. The guide rail frame comprises a connecting beam and guide rail beams, the connecting beam and the bottom frame are connected through hinge pins, and the front supporting arm is connected with the guide rail beams and comprises a cross beam and a front arm. The tree mover portal also comprises a front supporting arm front-rear adjustment oil cylinder arranged in the tree mover portal and a front supporting arm lifting adjustment oil cylinder, wherein one end of the front supporting arm front-rear adjustment oil cylinder is connected with the connecting beam of the guide rail frame, the other end of the front supporting arm front-rear adjustment oil cylinder is connected with the cross beam of the front supporting arm, on end of the front supporting arm lifting adjustment oil cylinder is connected with the top end of the bottom frame, and the other end of the front supporting arm lifting adjustment oil cylinder is connected with the front ends of the guide rail beams. Due to the fact that the front supporting arm front-rear adjustment oil cylinder and the front supporting arm lifting adjustment oil cylinder are arranged for the tree mover portal, the front supporting arm can perform multi-dimensional movements, and a tree mover is more flexible to operate. In addition, a slope adjustment oil cylinder is also arranged, can be connected with a rotary speed reducing box of the tree mover through a hinge pin and is used for adjusting the angle formed by a rotary bearing and the ground so as to ensure that cut and dug soil balls are regular.