The invention discloses a BIM (building information modeling)-based railway culvert design method. The BIM-based railway culvert design method includes the steps of S1, generating a whole-line culvert workpoint framework according to spatial line positions and culvert mileage information stored in a table; S2, establishing culvert segment templates; S3, establishing culvert segment frameworks by taking the culvert workpoint framework established in the step S1 as an input element; S4, instantiating the culvert segment templates established in the step S2 on the culvert segment frameworks established in the step S3. The BIM-based railway culvert design method has the advantages that an integral BIM-based railway culvert design scheme is achieved, railway culvert design is deepened and refined, railway culvert design means are improved, and the method is high in automation degree and practicality, capable of improving design efficiency and achievement quantity, thereby having remarkable popularization and application value.