The invention relates to the technical field of concrete construction, and particularly relates to a concrete construction method for a CRTSI double-block ballastless track roadbed slab. The method comprises the following steps: S1, carrying out raw material storage management; S2, detecting the water content of the aggregate; S3, inputting concrete mix proportion process parameters; S4, binding roadbed slab reinforcing steel bars and mounting a template; S5, carrying out concrete stirring; S6, detecting concrete performance, and determining whether the concrete performance is qualified or not; S7, wetting a supporting layer and a track block, and pouring concrete; S8, plastering and calendaring for multiple times; S9, spraying a maintenance liquid, and loosening the fishplates and the fasteners; and S10, removing the mold, spraying a curing agent on the two side edges of the roadbed slab concrete, and performing covering curing. The construction method is detailed in step, the quality of concrete construction is effectively guaranteed, and meanwhile the construction efficiency is improved. The method is mainly applied to ballastless track roadbed slab concrete construction.