The invention discloses a detection method and system for a refrigerator. The detection method comprises the steps that refrigerator state parameters gathered through all sensors arranged in different positions of the refrigerator are obtained; a fuzzy control proportion integration differentiation (PID) algorithm is used for processing the refrigerator state parameters to obtain processed result parameters; according to the processed result parameters, whether potential faults exist in the positions, where the sensors which gather the refrigerator state parameters are located, of the refrigerator is determined; and if yes, potential fault information corresponding to the potential faults is output so that a user can determine the positions, where the potential faults appear, of the refrigerator according to the output potential fault information. Thus it can be seen that according to the detection method and system, the refrigerator can be maintained in time before faults occur to the refrigerator, i.e. when the potential fault occur to the refrigerator, so that the service life of the refrigerator is prolonged.