The present invention relates to an irrigating device for injecting water (3) to a root of a tree (2), comprising an injecting device (10), a bucket (20), and a combining unit (30). The injecting device (10) includes an irrigating pipe (11) having a supporting plate (12) in one end of an upper part and an irrigating channel (13) inside, and includes one or more irrigating holes (14) penetrated to inner and outer sides of the irrigating pipe (11). The bucket (20) includes a storing container (21) with a combining hole (22) to be combined with an upper part of the injecting device (10), and a cover (23) which opens and closes an upper part of the storing container (21). The combining unit (30) prevents a leakage of the water (3) of the storing container (21) to the outside in a state of combining the injecting device (10) and the bucket (20). Accordingly, the present invention inserts the injecting device to the depth, in which fine roots of the tree for absorbing moisture and nutriment in soil are positioned, and supplies the water to the bucket combined with the injecting device. The present invention promotes root development and inhibits root growth of the ground by directly delivering irrigation to surroundings of the root below the ground. The present invention facilitates quantitative irrigation of an accurate amount of a supply by directly supplying a nutrient such as a water-soluble fertilizer excluding the water on the bucket to the tree. The present invention provides effective irrigation by increasing the number of buckets depending on a size of the tree.;COPYRIGHT KIPO 2020
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