The present invention relates to a device capable of stably supporting a tree without disturbing the growth thereof and capable of efficiently supplying the tree with flowing water, the device comprising: a protective unit comprising a lid body installed so as to cover soil on the ground surface around the periphery of the tree, the lid body having a space formed therein such that flowing water is collected, a lid cover for covering an upper opening of the lid body, and a pressurization member coupled to the inner wall of the lid cover so as to pressurize soil on the ground surface； a guide unit installed on a side portion of the protective unit, the guide unit comprising a guide body having a space formed therein such that flowing water is introduced therein and having a supply hole formed therein, through which the introduced flowing water is supplied downward into the ground, a filter coupled along the supply hole inside the guide body, and a guide cover for covering an upper opening of the guide body； a water storage unit installed on the side portion of the protective unit and connected to the guide unit, the water storage unit comprising a water storage tube having a space formed therein such that flowing water is introduced and stored therein, and a lighting module coupled to the upper portion of the water storage tube； a supply unit comprising a supply tube having the shape of a hollow barrel, the supply tube having multiple drain holes formed on the surface thereof and being coupled to the supply hole from below the guide body, and a water-containing member disposed inside the supply tube so as to contain flowing water supplied through the supply hole； and a support unit comprising multiple support frames having lower ends fastened to the guide cover and upper ends for supporting the tree, a fastening member for fastening the lower ends of the support frames to the guide unit such that the support frames can rotate inward/outward around a hinge, and a reinf
