The invention discloses a tedding mechanism of a tedding machine. The tedding mechanism comprises an arm rod, a push plate, a bracket, a lead screw 1, a lead screw 2, an upper connecting block, a lower connecting block, a spring, a U-shaped connecting plate, a lead screw 3 and a lead screw 4; the lead screw 1 is mounted at the upper end of the bracket; the lead screw 2 is mounted at the lower end of the bracket; the upper connecting block is arranged on the part, extending out of the bracket, of the lead screw 1; the lower connecting block is arranged at the part, extending out of the lower end of the bracket, of the lead screw 2; the lead screw 3 is mounted at the upper end of the U-shaped connecting plate; the lead screw 4 is mounted at the lower end of the U-shaped connecting plate; the part, extending out of the U-shaped connecting plate, of the lead screw 3 is connected with the lead screw 1 through the upper connecting block; the part, extending out of the U-shaped connecting plate, of the lead screw 4 is connected with the lead screw 2 through the lower connecting block; the upper end of the spring is fixedly connected to the lead screw 1, and the lower end of the spring is fixedly connected with the lead screw 4; and the lower end of the arm rod is mounted on the U-shaped connecting plate through rivets. The tedding mechanism has the advantages of low grain damage rate and high tedding efficiency.