The invention discloses an aircraft body attitude calculation method which is based on laser trackers. The attitude calculation method adopts a plurality of laser trackers to measure measurement points which are arranged on the measured aircraft body and used for expressing the aircraft attitude, and the current attitude of the aircraft part is calculated through the measurement values the theoretical values under the ideal designed attitude of the measurement points. The attitude calculation method takes into account the constraints to part of the measurement points, uses a least square error expression as a target function, utilizes a multi-target optimization model to combine the constraints and point matching, utilizes the Newton method to solve the optimization problem and obtains the aircraft body best attitude which is in line with the conditions of the constraints. The attitude calculation method adopts the advanced laser measurement technology to improve the precision of the measurement of the aircraft attitude; the attitude calculation method uses a plurality of points to carry out the attitude assessment and improves the accuracy of the attitude calculation by distributing errors to various points through the optimization function; and the attitude assessment takes into account the constraints of the measurement points and increases the flexibility of the attitude calculation by regulating the errors through the manual adjustment of weight value.