The invention discloses a construction method for concrete at the part of the climbing corridor of a roller compacted concrete dam, comprising the steps of: first, layering the roller compacted concrete dam; When pouring the roller compacted concrete layer of any dam to be poured, the steps are as follows: 201. Set the control line of the corridor surface layer, 202. Install the prefabricated formwork and cover of the side wall of the corridor that meets the height of the two germ layers of RCC Slab formwork, 203. The first RCC pouring, 204, The formwork is extended forward, 205. The second RCC pouring, 206. Repeat 204 to 205 until the RCC pouring reaches the closing level, 207. Remove the formwork buttresses, and 208. Concrete the second-phase normal concrete pouring layer of the bottom surface layer of the pouring corridor. The template of the invention is prefabricated by upper and lower blocks, which is convenient and flexible, and the template assembly and the layer-by-layer laying and pouring of the roller compacted concrete germ layer are constructed synchronously.