The invention relates to a static voltage stable level analyzing method for a power grid. The method includes determining level year means data, forming a stable-state calculating data file and conducting trend calculation, forming desirable accident set and determining fault based on ground-state data with excellent convergence, conducting static voltage stable calculation and analysis, determining voltage stable weak nodes of the power grid at a power limit point through modal analysis, and improving the static voltage stable level by applying reactive compensation measures on weak nodes of the power grid. The power transmission profile of a regional power grid is taken into consideration, the consideration scope of static voltage stability is expanded, and the voltage collapse analysis is more thoroughly. The stable-state calculating data file is rapidly updated based on on-line power grid data and through database technology, and the work efficiency is improved.