The invention discloses a reliability analysis method for an industrial robot electrical driver based on a Copula function, and the method comprises the following steps: S1, determining a main failuremode of an electrical driver, and finding out a component corresponding to the main failure mode; S2, establishing a limit state equation corresponding to each main failure mode of the electric driver; S3, generating a Monte Carlo simulation sample by using a Monte Carlo method, and calculating the occurrence probability of each main failure mode; S4, carrying out qualitative analysis on the correlation among the main failure modes, and determining an alternative Copula function type; S5, selecting an optimal Copula function and determining parameter values of the function; and S6, calculating the failure probability and reliability of the industrial robot electrical driver considering multi-failure mode correlation. According to the method, a Copula function method is used for describingthe correlation among all main failure modes, and on the premise that the precision is guaranteed, the calculation efficiency of reliability analysis conducted on the electrical driver through a traditional Monte Carlo simulation method is improved.