The invention discloses an analysis method for the influence of a narrow V-shaped river valley on steep slope dam block concrete temperature control and crack prevention, and relates to the technicalfield of water conservancy projects. The analysis method includes the following successively processed steps that a three-dimensional calculation model including a foundation and a dam structure is established to form a calculation condition, and the temperature and stress distribution law of dam concrete under the narrow V-shaped river valley are obtained, the temperature and the magnitude of stress of dam body concrete under different river valley forms are analyzed, and the extent and range of the influence of the river valley forms on the maximum stress of the dam body concrete are obtained. The analysis method provides a safe and scientific systematic analysis method for narrow V-shaped river valley damming.