The invention discloses a high-speed railway normalized train working diagram period determination method comprising the following steps that high-speed railway stations are divided into multiple levels of nodes; the stop rate and the stop frequency of each level of node are determined according to the stop rate of the lowest level of station; the types and the number of the trains in one period of the normalized train working diagram are determined; and the length of the period T of the high-speed train working diagram is calculated. The passenger flow requirements and the traveling time along the high-speed railway can be fully met, and the requirements of braiding the normalized train working diagram of different high-speed railway lines can be met.