The invention discloses a bearing seal device of a conveyer roller. The bearing seal device of the conveyer roller comprises a roller bearing. A cylindrical roller support bearing is placed in a bearing chamber arranged in the middle of the roller bearing. Oil seals are arranged on the two sides of the cylindrical roller support bearing in a filling manner. Grooves for containing O-rings are formed in the two ends of the bearing chamber and provided with seal covers fastened by means of bolts. A front seal piece is additionally arranged at the front end of the roller bearing, a back seal piece is additionally arranged at the back end of the roller bearing. The front seal piece is composed of a front grind cover, a bolt, a compression spring, face seal pieces, a flexible connection piece and hose clamps. The back seal piece is composed of a back grind cover, face seal pieces, a compression spring, a flexible connection piece and hoes clamps. The front end and the back end of the roller bearing are axially provided with the compression springs. The contact portions between the two ends of each compression spring and the roller bearing are sealed through the corresponding face seal pieces. The face seal pieces of each of the front seal piece and the back seal piece are connected with the corresponding hose clamps through the flexible connection piece. The front end of the roller bearing is provided with the front grind cover which is fastened through bolts, and the back end of the roller bearing is provided with a back grind cover. The back grind cover is installed at the shaft shoulder position of the roller.