The invention relates to a power flow non-convergent section adjusting method and device. The method comprises the steps of: obtaining power flow convergent sections with the same power grid topological structure as a to-be-adjusted section, and determining reference section of the to-be-adjusted sections according to the total active power of a generator set in each power flow convergent section;correcting the reference section of the to-be-adjusted sections; and adjusting the to-be-adjusted sections according to the corrected node voltage in the reference section, the branch active power and the power transmission section active power. According to the method, the reference section of the non-convergent sections is determined, and the non-convergent sections are adjusted based on the reference section, so that the link of manual operation is omitted, the adjustment speed is high, and the problem of section non-convergence can be effectively solved.