To meet the requirements of field attitude measurement accuracy evaluation of large-scale precision engineering, a method of attitude angle field accuracy evaluation is proposed by tracing the measurement results of attitude angle to the length measuring standards. Firstly, the basic composition and measurement principle of the laser tracking attitude measurement system are introduced. Secondly, the mathematical model between space distance and target attitude is formulated, which is based on the forward kinematics research of six-degree-of-freedom (6-DOF) parallel mechanism. The Monte Carlo method is used to simulate and analyze the effect of distance constraint measurement accuracy, control field layout and the working distance of the system on the evaluation model accuracy. Finally, an experimental platform is established, and the relative rotation of the precision turntable is used as the angle benchmark to evaluate the feasibility of the research method. Results show that the azimuth accuracy of the model is 0. 055 ° and the pitch accuracy is 0. 058 ° within the angle range of - 20° ~ 20°, when the distance constraint measurement accuracy is 0. 038 mm and the size of the control field is 1 400 mm×1 400 mm. In conclusion, the research method in this article avoids the strict requirements of the coordinate system registration in the evaluation method based on angle benchmark. It could comprehensively reflect the field use state of the measurement system, which can provide a reference for the attitude angle field accuracy evaluation method in the 6-DOF laser tracking measurement system.