A channel baffle structure for a HTR nuclear power plant, comprising a pipe , a swing check plate and a driving apparatus : the swing check plate comprises a tongue plate , a crank connecting rod and a rotating shaft , one end of the crank connecting rod is connected with the tongue plate through a nut, and the other end of the crank connecting rod is welded to a shaft sleeve of the rotating shaft ; the pipe wall of the pipe is provided with a circular opening for placing the tongue plate in a fully open state and the crank connecting rod , a circular branch pipe is welded at the circular opening, an axis of the circular branch pipe is perpendicular to an axis of the pipe , an end of the circular branch pipe is in a form of flange structure and connected with a pipe side cover plate by bolts; the tongue plate , the crank connecting rod and a part of the rotating shaft of the swing check plate are arranged within the pipe , the driving apparatus is arranged outside the pipe ; the swing check plate and the driving apparatus are connected through the rotating shaft , a bevel gear and a driving apparatus connecting shaft ; one end of the rotating shaft is connected with the swing check plate, and the other end is connected with the bevel gear ; one end of the driving apparatus connecting shaft is connected with the bevel gear , and the other end is connected with the driving apparatus ; wherein a structure for connecting the driving apparatus and the swing check plate, comprises a key installed on the rotating shaft connected with the crank connecting rod , an annular keyway correspondingly set within the shaft sleeve of the rotating shaft , such that the shaft sleeve has an idle travel of 90-degree free rotation around the rotating shaft , and the key is positioned within the annular keyway . the swing check plate comprises a tongue plate , a crank connecting rod and a rotating shaft , one end of the crank connecting rod is connected with the tongue plate through a nut, and the other end of the crank connecting rod is welded to a shaft sleeve of the rotating shaft ; the pipe wall of the pipe is provided with a circular opening for placing the tongue plate in a fully open state and the crank connecting rod , a circular branch pipe is welded at the circular opening, an axis of the circular branch pipe is perpendicular to an axis of the pipe , an end of the circular branch pipe is in a form of flange structure and connected with a pipe side cover plate by bolts; the tongue plate , the crank connecting rod and a part of the rotating shaft of the swing check plate are arranged within the pipe , the driving apparatus is arranged outside the pipe ; the swing check plate and the driving apparatus are connected through the rotating shaft , a bevel gear and a driving apparatus connecting shaft ; one end of the rotating shaft is connected with the swing check plate, and the other end is connected with the bevel gear ; one end of the driving apparatus connecting shaft is connected with the bevel gear , and the other end is connected with the driving apparatus ; wherein a structure for connecting the driving apparatus and the swing check plate, comprises a key installed on the rotating shaft connected with the crank connecting rod , an annular keyway correspondingly set within the shaft sleeve of the rotating shaft , such that the shaft sleeve has an idle travel of 90-degree free rotation around the rotating shaft , and the key is positioned within the annular keyway . <EOS>