The invention provides a cladding power stripper and an optical fiber laser, and belongs to the field of an optical fibre device. The cladding power stripper comprises acting optical fibers, a light-transmitting heat-conducting sheet and a packaging shell; the acting optical fibers are positioned in the packaging shell; the light-transmitting heat-conducting sheet is attached to the inner wall of the packaging shell; and an optical power stripping window is formed in the surface of the optical fibers, and the optical power stripping window faces to the light-transmitting heat-conducting sheet. Light beam transmitted in the acting optical fiber cladding layer emits from the optical power stripping window to come to the light-transmitting heat-conducting sheet, so that the light beam can be stripped from the cladding layer. Compared with the prior art, the structure of the cladding power stripper is effectively simplified and the weight of the device is reduced; and when the cladding power stripper is applied to the optical fiber laser, the structural simplification of the optical fiber laser can be facilitated.