Disclosed is a bound water saturation degree determination method. The method comprises the following steps of acquiring the permeability of a reservoir, the porosity of the reservoir and the sludge content of the reservoir; according to the permeability of the reservoir, the porosity of the reservoir and the sludge content of the reservoir, determining formation water flow index; and according tothe formation water flow index, determining the bound water saturation degree of the reservoir. By virtue of the method and the device, the calculation precision of the bound water saturation degreecan be improved.