The invention discloses a method for adjusting dead-zone compensation of a control fastener of an adjusting valve of a half-speed turbine of a nuclear power plant. The method comprises the steps of: firstly, determining a mechanical dead zone parameter value of a proportional direction valve and a dynamic response parameter value of the adjusting valve, and setting a parameter value of a dead zone of a Vickers fastener to be smaller than the mechanical dead zone parameter value but greater than the dynamic response parameter value of the adjusting valve to avoid frequent action of the proportional direction valve and guarantee the action accuracy of the proportional direction valve. After the method disclosed by the invention is adopted for adjusting the parameter, the adjusting valve and an oil pipe work steadily at a full power, a machine set can run for a long time at the full power, the failure probability of a RGL power failure probability module caused by frequent fluctuations of a temperature control rod is also reduced, the tripping hazards of a power station are removed, and a plenty of manpower and material resources are saved.