The invention provides a new energy grid-connected planning optimization method based on short-circuit current margin. Firstly, the short-circuit current is evaluated for the busbars of the voltage levels of the centralized grid-connected points under the grid-connected planning scheme, and whether the short-circuit current of each busbar of the corresponding grid-connected points exceeds the standard is determined according to the short-circuit current margin index Igt. The grid-connected capacity and grid-connected mode of the new energy electric field are optimized and adjusted according tothe judgment result. According to the invention, problems such as line overload and voltage over-limit of a near-zone system after the new energy is subjected to centralized grid connection are effectively avoided. Finally, by combining system safety and stability assessment results and economic factors, the grid-connected planning scheme is comprehensively optimized. The method is simple and fast, and provides practical guidance suggestions for power system operation and planning personnel; the problem is solved that short-circuit current exceeds the standard at the grid-connected point after the centralized accessing of the large-scale new energy; and the safety and stability of power system operation are improved.