Adjustable tree supporting device

The utility model discloses an adjustable tree supporting device which can be adjusted along the diameter of a tree. Connection holes in the lower ends of three upper connection parts are respectively aligned to the upper end connection holes of upper connection rods of a vertical rod device and are tightly connected through bolts, the lower end connection holes of lower connection rods of the vertical rod device are connected with lower connection foot bolts of a base device, the middle of each upper connection part is provided with a through hole, the inner layer of each upper connection part is provided with a rubber gasket, one end of a connection belt is provided with a lock clamp, and the other end of the connection belt is provided with an arc. The upper end of each upper connection rod is provided with the connection hole, the lower end of each upper connection rod is provided with a tail rod used for placement of a spring, adjusting sleeve rings are connected with middle connection rods connected wit