The invention discloses an antiseep bearing pedestal device for a roller. The antiseep bearing pedestal device comprises a main bearing, a bearing box, a rear end cover and a sealing mechanism. The sealing mechanism is installed on the roller shaft neck portion located at the inner end of the main bearing. The sealing mechanism comprises an L-shaped transition sleeve fixedly installed on the roller shaft neck portion, and an inverted-L-shaped front end cover installed on the periphery of the L-shaped transition sleeve. The outer end of the L-shaped transition sleeve makes contact with the endface of an inner ring of the main bearing. The inverted-L-shaped front end cover is fixedly installed at the inner end of the bearing box and makes contact with the end face of an outer ring of the main bearing. An external water seal is arranged between the inner end of the inverted-L-shaped front end cover and the roller. A Z-shaped channel is formed between the inverted-L-shaped front end coverand the L-shaped transition sleeve. A labyrinth cavity, an internal water seal and a framework oil seal are sequentially arranged in the Z-shaped channel from outside to inside. According to the antiseep bearing pedestal device, three waterproof mechanisms are adopted, the embedding type water stop structure is matched, and by means of the centrifugal separation principle, impurities such as water and iron powder can be discharged out of a machine body completely.