The invention discloses an ecological slope protection supporting structure for water conservancy projects. The ecological slope protection supporting structure for the water conservancy projects includes a rock-soil layer, a planting box, a first through hole, a connecting rod, vegetation seeds, a top cover, a water pipe and a cement layer, a grid frame is arranged on one side of the rock-soil layer, and the planting box is arranged on the side, away from the rock-soil layer, of the grid frame. According to the ecological slope protection supporting structure for the water conservancy projects, the grid frame and the connecting rod are arranged, when the connecting rod is moved to a connecting rod groove through the first through hole, the connecting rod drives a first clamping block to enter a first installation groove, the connecting rod is rotated, the external dimension of the first clamping block corresponds to the internal dimension of the first clamping groove, the first clamping block and the first clamping groove constitute a clamping structure to convenient for fixing the first clamping block in the first clamping groove, removal of the first clamping block from the first clamping groove due to shaking of the connecting rod is avoided, at the same time, when the planting box is damaged, removal of the planting box is convenient for replacing, work intensity of staffis reduced, and the work efficiency is improved.