The utility model relates to a tree planting device which is used for planting tree in ground with loose soil. The utility model consists of a L-shaped left handle and a L-shaped right handle, and the middle parts of the L-shaped left handle and the L-shaped right handle are connected bilaterally symmetrically with a C-shaped centralizer through a gemel. The lower ends of the left handle and the right handle are respectively fixedly provided with a left half taper shell and a right half taper shell which are symmetric with each other. As the lower end of the utility model takes a taper shape, when in use, the root of the sapling seedling is only needed to be put into the taper shape body; the tree trunk is put into the C-shaped centralizer; the front end of the utility model and the sapling seedling are both emphatically inserted into soil by holding the upper end of the left handle and the right handle; upper ends of the left handle and the right handle are turned inward to separate the left half taper shell and the right half taper shell which are positioned at the lower part of the left handle and the right handle; the root inside the taper shape body is loosed; then the left handle and the right handle are lifted upward; and then a full tree planting process is completed by taking the front end of the utility model from the soil. The utility model has the advantages of easy, fast use and high efficiency.