In order to investigate the characteristics of water and nitrogen migration under multi-point source infiltration in the muddy water-filled membrane hole irrigation, the indoor hydrophobic membrane hole infiltration device was used to test the influence of the infiltration solution (0 g/L, 1 g/L, 2 g/L, 3 g/L, and 4 g/L ammonium nitrate solution) on the infiltration laws, the occurrence time of one-way intersections and multi-directional intersections, the water content in the vertical direction of film hole centers and junctions (the plant intersection center, the inter-row intersection, and the 4-point source intersection),and the distribution law of NO₃^--N. The results showed that the cumulative infiltration and permeation time per unit area of membrane pores showed a power function relationship, the infiltration index a decreased with the increase of fertilizer concentration while the infiltration index b increased with the increase of fertilizer concentration. With the increase of fertilizer concentration, the occurrence time of one-way intersection and multi-directional intersection was advanced. At the depth of 10 cm soil, the water content of each center increased by 10.42%, 13.94%, 16.38%, and 24.74%, respectively, compared with 0 g/L treatment. The water content in each center varied with the increment of soil depth. NO₃^--N was evenly distributed in the upper layer of the soil, and showed peak at the wet front. The NO₃^--N content at the 4-poing source intersection center was higher than the other 3centers.The results provide a basis for improving the theory of water-filled membrane hole irrigation.