The invention provides an evaluation method for impact of wind power integration on a power grid transient state as well as medium and long term reliability on the basis of investigating and surveying domestic and overseas power grid reliability evaluation research progress and combining the impact condition of the wind power integration on power grid characteristics, and constructs an impact evaluation algorithm process of the wind power integration on the power grid transient state as well as medium and long term reliability. With the adoption of the evaluation method, the impact of wind power on system safety performance can be visually expressed by quantitative evaluation indexes, wind power source factors influencing the power system safety performance are identified, and scheduling and operatorsing personnel can be guided to formulate corresponding precaution and improvement measures, so that the impact of the wind power integration on the power grid can be reduced.