The present invention relates to an optical fiber sensor installation quality control method, a device for implementation of the method and an application of applying the method to optical fiber sensor installation quality control in a transformer, especially to the field of a sensor for a transformer. A principle is employed that lights with the same phase can generate interference subtraction tocause light intensity changing of diffraction patterns, and light having the same phase as light input to the optical fiber senor and having different optical path difference from the light input tothe optical fiber senor is taken as a reference to determine whether the optical fiber sensor can make an accurate response only according to an environment temperature, so that a timely and accuratedetermination can be made for installation quality and s condition that improper stress is received in the installation and usage processes of the optical fiber sensor. The optical fiber sensor installation quality control method is especially suitable for temperature detection of a transformer and detection of an optical fiber sensor, and is suitable for detection through adoption of Bragg grating and detection of an optical fiber sensor for measurement of any physical parameter.