The invention relates to a new energy acceptance space discrete probability sequence solving method. Firstly the start-up mode of a thermal power generation set is set up; new energy output is brought to start-up power balance of the thermal power generation set so that the daily start-up capacity of the thermal power generation set and the minimal technical output data are obtained; then the correlation of the maximum daily load and the minimal technical output of the thermal power generation set is considered, and the joint probability distribution of the maximum daily load and the minimal technical output of the thermal power generation set is solved; the joint probability distribution of the maximum daily load and the load is accordingly solved; and finally the volume difference of the load sequence corresponding to the same maximum daily load discrete value and the thermal power minimum output sequence is performed, an acceptance space sequence corresponding to the maximum daily load discrete value is solved, and the acceptance space sequence corresponding to each maximum daily load discrete value is solved in turn so that the acceptance space discrete probability sequence of the system is obtained after compilation.