The invention discloses a method for handling jamming of a pressure cylinder valve in a steam turbine. The method includes the steps that A, the valve is closed; B, an original bearing of the valve is replaced with a substitutive bearing, and the substitutive bearing can bear a higher temperature compared with the original bearing; C, an original lubricant of the valve is replaced with a substitutive lubricant, and the high-temperature stability of the substitutive lubricant is higher than that of the original lubricant; D, a steam shield is arranged on the side, facing a valve steam chamber, of the bearing of the valve, and the steam shield, a valve shaft of the valve and the inner wall of the steam chamber of the valve are sealed; and E, a heat dissipation device is arranged on the outer portion of a bearing chamber at the non-driving end of the valve. By means of the technical scheme, the problems that due to mechanical sealing of the valve, high temperature is generated, and then valve jamming is caused are solved; and a valve closing device used in the handling method, force needed for closing the valve can be provided, and the valve can be closed more easily and effectively.