a tidal energy storage , power generation method is disclosed . during one tidal period , the method includes the following steps : during the early stage , forming a float into an enclosed hollow float ; during the flood tide stage , converting the ascending potential energy of the float into the gravity potential energy of an energy storage assembly ; during the slack water stage , charging the float with water ; and during the tide ebbing stage , forming the float into an enclosed body filled with water , and converting the descending potential energy of the float into the gravity potential energy of the energy storage assembly . a tidal energy storage , power generation system is also disclosed . the system can improve the utilization rate of the tidal energy .