The invention discloses a contactor attraction time qualification rate predicting method based on Monte Carlo simulation, belongs to the technical field of contactor detection and solves the problem of high cost in designing and testing and long designing cycle caused by the fact that samples are needed to be processed and manufactured in a method for testing attraction time parameters in an existing contact designing process. The method includes determining designing values and upper and lower limits of three parameters having influences on attraction time according to a contactor designing file and generating N groups of parameter combinations by adopting an independent identically distributed central limit theorem and utilizing MATLAB; acquiring N groups of attraction time characteristic parameters according to the N groups of parameter combinations; acquiring distribution characteristics of the attraction time parameters; acquiring a contactor attraction time qualification rate of a contactor by utilizing a Simpson law according to the distribution characteristics and attraction time designing parameters of a contactor. The contactor attraction time qualification rate predicting method based on Monte Carlo simulation is suitable for predicating and analyzing the qualification rate of contactor attraction time in a designing link of the contactor so as to provide a basis for a designer of the contactor to correct designing parameters.