The invention discloses a tree infusion insertion power assisting device. The tree infusion insertion power assisting device is characterized by comprising a fixed clamping portion and a movable clamping portion. The fixed clamping portion and the movable clamping portion are provided with opposite coincident faces respectively. A fixed sunken part is arranged on the coincident face of the fixed clamping portion. A movable sunken part is arranged on the coincident face of the movable clamping portion. The space which is defined by the fixed sunken part and the movable sunken part after the coincident faces coincide with each other is matched with the connecting portion at the tail end of a syringe needle in shape. The fixed clamping portion is connected with a holding handle through a connecting body. A locking mechanism is arranged between the fixed clamping portion and the movable clamping portion. When the tree infusion insertion power assisting device is in use, the connecting portion at the tail end of the syringe needle is held between the fixed clamping portion and the movable clamping portion, the syringe needle can be inserted into a tree trunk easily by exerting force through the holding handle, the problem caused when the syringe needle is inserted manually is solved, no holes need to be drilled in the tree trunk, damage to internal tissue of the tree trunk is small, later growth and mature of the tree are facilitated, and the quality of the tree or fruits is improved.