The invention discloses a chain block with a seal lubricating device, and comprises a chain block, a seal shield, an isolation plate, folding and unfolding holes, and a seal pad; the seal shield is arranged outside the chain block, and welded with the chain block; the isolation plate is arranged on the bottom of the seal shield, and welded with the shield; the folding and unfolding holes are arranged on the bottom of the isolation plate, and being a plurality of round through holes; the seal pad is arranged in the center of the folding and unfolding holes, is in a cylinder shape, and glued with the folding and unfolding holes. Firstly, an outer wall of the chain block is welded with the seal shield, and an inner side is filled with lubricating oil so as to fully lubricate all parts, thus thoroughly solving the poor lubrication problems in the prior art, greatly improving hoist smoothness of the chain block, and preventing deadlocking phenomenon.