The invention discloses a method for calculating an influence index value of short-circuit current of a grid-connection scheme of a new energy cluster. The method comprises the steps of: S1, determining a short-circuit current value Ii of each station in the power grid of the region under the grid-connection scheme of the new energy cluster when none of the clusters is powered on; S2, determininga sensitive station in the grid, a short-circuit current value IM0i of the sensitive station, and a combined influence weighted value lambda i of the sensitive station when none of the clusters is powered on according to the relevant data of a circuit breaker of each station; S3, determining a short-circuit current value IMqi of the sensitive station when all the clusters are powered on under thegrid-connection designing scheme of the new energy cluster; and S4, calculating the influence index value of short-circuit current of the new energy cluster according to the short-circuit current value Ii of each station in the step S1, the combined influence weighted value lambda i of the sensitive station when none of the clusters is powered on in the step S2, and the short-circuit current valueIMqi of the sensitive station when all the clusters are powered on in the step S3. The method is good in computability and wide in adaptability.