The invention provides a combined greening engineering hole-drilling planting device. The device comprises a hole drilling rod structure, an adjusting fixing frame structure, a movable base structure, a protective plate structure, a mixing pipe structure, a push plate structure and a slotting plate structure, and the hole drilling rod structure is fixed to the upper left portion of the adjusting fixing frame structure; the adjusting fixing frame structure is installed on the left side of the upper surface of the hole drilling rod structure through bolts; the protective plate structure is welded to the left end of the movable base structure; the mixing pipe structure is welded to the upper portion of the left end of the adjusting fixing frame structure. The combined greening engineering hole-drilling planting device has the advantages that through the arrangement of the hole drilling rod structure, holes in different width and depths are drilled conveniently, and meanwhile plants with different sizes are planted conveniently; through the arrangement of the adjusting fixing frame structure, the width of the greening engineering hole-drilling planting device is conveniently shortened, and meanwhile the greening engineering hole-drilling planting device is used in an extremely narrow place conveniently.