This invention provides a method for one-time pouring of the dam overflow surface. The dam or overflow section is divided into a modified concrete zone, a first roller-compacted concrete zone, a second roller-compacted concrete zone, and an
erosion-resistant and wear-resistant concrete zone, based on the upstream to downstream cross-section. Construction is carried out in the modified concrete zone, the first roller-compacted concrete zone, and the second roller-compacted concrete zone. After the second roller-compacted concrete is constructed, its right end slopes downwards to form a step on the surface overflow surface. Then, the
erosion-resistant and wear-resistant concrete zone is poured in one go. The construction process of the
erosion-resistant and wear-resistant concrete zone includes the following steps: S1, foundation treatment; S2,
rebar tying; S3, formwork installation; S4, concrete pouring; S5, formwork removal; S6, concrete finishing; S7, concrete curing. This method for one-time pouring of the dam overflow surface improves the construction quality of the dam overflow surface by pouring the erosion-resistant and wear-resistant concrete in one go after the roller-compacted concrete construction is completed.