The invention provides a method for calculating water pumping and power generating hours of a single machine of a pumped storage power station. The method comprises the following steps: firstly, in a power generating situation, if A1-A6 is greater than A7-A3, then A3 equals to A1-A2; if A1-A6 is less than A7-A3, then A1-A6 equals to A1-A2; and calculating power generating hours T1; secondly, in a water pumping situation, if A3-A8 is greater than A5-A1, then A5-A1 equals to A3-A4; if A3-A8 is less than A5-A1, then A3-A8 equals to A3-A4; and calculating water pumping hours T2; thirdly, realizing logic computation through a monitoring system of ANDRITZ so as to realize the functions of updating and uploading the data in real time. According to the method, the water pumping and power generating hours can be updated and uploaded in real time through a program; hidden reservoir capacity limiting conditions are utilized skilfully; a simple alignment algorithm but not a conventional iterative algorithm is adopted, so that the program is simplified, and meanwhile, the load rate of a system can also be reduced very well.