Abstract: With rapid development of underground engineering, the problem of surge water has become one of the main problems restricting the safety and operation of engineering. In this study, through the self-developed visualization of rough fissure negative pressure suction combined with magnetic convergence device, we carry out tests of moving water fissure negative pressure suction-magnetic grouting under the action of multi-factors, focusing on the analysis of different fissure inclination angles, negative pressure suction forces, moving water flow rates and the magnetic field strengths of the influence mechanism on the spread of the slurry, and establish the model of tilted fissure negative pressure suction-magnetic convergence moving water grouting under the consideration of magnetic field strength. ① Under the condition that other factors remain unchanged, compared with ordinary slurry, the maximum diffusion area of 90° fissure magnetic slurry under the action of magnetic field is enhanced by 49.02%, the maximum backwater diffusion distance is increased by 61.89%, and the maximum lateral diffusion distance is increased by 56.91%. It indicates that the magnetic field action can effectively enhance the slurry diffusion area. ② The slurry diffusion area grows by 600.78 cm² at 0° inclination with a suction force of 80 kPa, and the growth rate of diffusion area is 17.66%. It shows that the negative pressure suction force has a certain effect on the increase of slurry diffusion area. ③ The degree of influence of on the slurry diffusion area is the fracture angle, the dynamic water flow, the negative pressure suction force and the magnetic field strength in the order of strongest to weakest. ④ The negative pressure suction-magnetic convergence dynamic water grouting model is established, and the maximum relative error is not more than 11.37% compared with the experimental data, which indicates that the model can better describe the diffusion process of the slurry, and can provide new research ideas and theoretical references for grouting and filling of water-surge fissures under different inclination angles.