The invention discloses a simplified calculating method of a double-fed motor three-phase short circuit current maximum. The method comprises the steps of firstly giving a double-feed motor three-phase short circuit current calculating formula which calculates a Crowbar resistor; then utilizing a sensitivity analyzing method to analyze the influencing degrees of various physical quantities on the sizes of the short circuit currents in the formula, and extracting a group of parameters which have greater influence degrees on the short circuit currents; finally utilizing the extracted parameters and multiple linear regression to analyze and deduce the simplified calculating formula of the double-feed motor three-phase short circuit current maximum. A simple method is provided for calculation of the double-fed motor three-phase short circuit current maximum, the calculating accuracy and practicability are achieved at the same time, and the simplified calculating method of the double-fed motor three-phase short circuit current maximum has great significance on economic security design of electrical equipment of a wind power plant.