The invention provides a check method for a suspicious breakpoint in a power grid model. The method mainly comprises: sorting substation center coordinates; by using a dichotomy, finding out the substation center coordinates close to a power line endpoint; and according to optimized two-point overlap criteria, determining whether the endpoint is on the circumference of a substation, thereby obtaining a result whether the line endpoint is a breakpoint. The method can identify all suspicious breakpoints in the grid, has an error positioning function, and can timely correct errors, ensure the correctness of a system model, effectively prevent incorrect setting accidents, guarantee the safety operation of the grid and play an important role in ensuring and improving economic benefits for power enterprises.