The problem of insufficient load bearing capacity of crossing over the goaf has become increasingly serious. In order to solve the problem of the Mujia Passenger Dedicated Railway crossing the goaf of the coal mine, this paper designs and implements the on-site grouting scheme for the goaf, and finally evaluates its effect with a variety of grouting reinforcement effect evaluation methods. The research shows that the full filling pressure grouting method can effectively improve the broken and hole problems in the goaf of the Mujia Passenger Dedicated Railway. At the same time, the feasibility and accuracy of the design scheme and on-site implementation are further verified through on-site coring, indoor mechanical property test, wave velocity measurement, regional hole location grouting effect detection and CT detection technology. Finally, the grouting effect is evaluated in combination with relevant professional specifications. The conclusions can be used as an effective supplement to the survey, design, implementation and detection of such projects.