The invention relates to the technical field of power grid planning, and specifically relates to a system for diagnosing and analyzing the current situation of a power grid. The system is characterized in that four layers of evaluation indexes are set, wherein the first layer is a comprehensive score of the operation level and the power supply capability, the second layer is the operation level and the power supply capability, the third layer is comprehensive operations, lines, distribution transformers, switches, distribution network power supply points and a distribution network, the comprehensive operations, the lines, the distribution transformers and the switches belong to evaluation for the operation level, the distribution network power supply points and the distribution network belong to evaluation for the power supply capability, the fourth layer is specific evaluation indexes for each part; and a comprehensive score of each layer of indexes is acquired through performing summation after being weighted by a score of the lower layer, and a comprehensive score of the operation level and the power supply capability of an evaluated region is acquired finally by performing layer-by-layer weighting and summation on all indexes. Calculation formulas for each layer of evaluation indexes are preset in a processor and a result is calculated automatically after required data is obtained. The system clearly divides all kinds of indexes, shortens the calculation period and improves the calculation accuracy.