The utility model provides a turning device for clearing up composite solid propellant casting hopper, pouring hopper passes through the hopper journal stirrup of both sides and installs the upper end at two rotation support frames. Multistage circular cone speed reducer is located the upper portion of a base support. The input shaft of this multistage circular cone speed reducer and the output shaft connection of cross spiral bevel gear switching -over speed reducer. The hand wheel is installed on the input shaft of this cross spiral bevel gear switching -over speed reducer. This cross spiral bevel gear switching -over speed reducer is located the below of multistage circular cone speed reducer. When operator person rotated the hand wheel, through cross spiral bevel gear switching -over speed reducer, the output shaft that drives the multistage circular cone speed reducer that joins with it rotated, and then drove to produce with the hopper pouring support of this output shaft connection and deflect, drove the hopper rotation through hopper pouring support to realized 90 degrees upsets of pouring hopper clearance in -process, avoided personnel to get into the operating type that the hopper carries out disentanglement operation, thereby eliminate the potential safety hazard of hopper disentanglement operation to operator person.