The tail support mechanism is a multi-purpose support equipment developed for a large low-speed wind tunnel. Its main uses include supporting the fighter model to complete the task of measuring force and pressure at high angles of attack, with the continuous range of angles of attack from -15° to + 90° and the continuous range of sideslip angle from ± 35°; Support large-scale models (with a maximum wingspan of 6m) to complete conventional force measurement, pressure measurement, ground effect test and other tasks, and meet the continuous change range of angle of attack from -10° to + 75°; Support special models for special tests, including slender body models, propeller models, dynamic simulation test models, etc. The standard model test shows that the mechanism has strong rigidity, firm model support, flexible operation and accurate positioning of model attitude change, which can meet the needs of conventional and a large number of special model support and attitude change.