The invention discloses a new-energy-power-station-performance-index rolling calculation method adapting to the short time scale, and belongs to the technical field of power systems and automation thereof. According to a grid-connection-power prediction curve, a grid-connection-power actual curve and a previous calculated prediction accuracy result of new energy power stations of unlimited time parts in a current calculation period, transmission periods of predicted data and power data are considered, and the grid-connection-power prediction accuracy is calculated in a weighted mode; accordingto a grid-connection-power control instruction curve, a grid-connection-power actual curve and a previous calculated adjusting performance result of limited time parts in the current calculation period, transmission periods of instruction data and power data are considered, and the grid-connection-power adjusting performance is calculated in a weighted mode. According to the new-energy-power-station-performance-index rolling calculation method adapting to the short time scale, on the premise that the correct calculation result is guaranteed, calculation efficiency is greatly improved, and thereliability of a control system is enhanced.