The present disclosure relates to a channel baffle structure, which belongs to the technical field of fluid mechanical technology. The baffle structure comprises a pipe (1), a swing check plate and a driving apparatus (8), wherein the main part of the swing check plate is located inside the pipe (1), and the driving apparatus (8) is arranged outside the pipe (1). In addition, the baffle structure also comprises a special connection structure used for connecting the driving apparatus (8) and the swing check plate, specifically, a key (14) is installed on the rotating shaft (4), an annular keyway (15) is correspondingly set within the shaft sleeve (13), such that the shaft sleeve (13) has an idle travel of 90-degree free rotation around the rotating shaft (4). According to the different positions of the key (14) in the annular keyway (15), the channel not only has the passive characteristics to realize opening and closing by the gravity and fluid pressure, but also has the active characteristics to realize opening and closing and maintain small opening by the driving apparatus, such that requirements for multiple operating conditions of the channel can be satisfied.