The invention discloses a fountain mechanism capable of forming an effect of flow impact. The fountain mechanism comprises a hollow cavity body, the end face of the cavity body is provided with 2n mounting seats, n is a natural number except zero, L-shaped injection water pipes are arranged on the mounting seats, pipe openings of every two L-shaped injection water pipes are opposite, and transparent stop blocks are arranged between the water outlets of every two L-shaped injection water pipes arranged opposite. According to the fountain mechanism capable of forming the effect of flow impact, arrangement structure can form the effect of clashing, rebounding and sputtering of backwater during far-seeing, and the fountain has better ornamental value. Spot lamps are arranged at the bottoms of the transparent stop blocks, so that the ornamental effect of the fountain at night can be improved. The transparent stop blocks adopt pressing luminescent screens, so that compared with the spot lamp, the effect of rebounding and sputtering after water touching is reflected more visual.