The invention discloses a water level dynamic control method of a daily regulation reservoir in different periods, which includes that according to the proportion of the runoff in flood season to thetotal runoff in a year, the daily regulation reservoir is divided into four different periods of low water period, dry-flood alternating period, flood season and dry-flood alternating period, and thewater level dynamic control is respectively carried out in four different periods. In the process of dynamic control of water level, the reservoir is regulated to keep high water level in dry season,the small flood before flood is fully utilized in dry season, and the water level is kept at a reasonable high level, the flood resources are utilized to generate more power in flood season, and the autumn flood is utilized to generate more power in dry season, which is the control objective to determine the water level control scope in each period. The invention improves the economic operation level of the daily regulating reservoir and realizes the rational utilization of flood resources.