Based on affective event theory, the research constructs a model of the mechanism by which negative customer feedback, through work rumination, affects the career resilience of gig workers. Data from 123 food delivery riders was collected over five days using a diary study method, and these 615 valid empirical data points were analyzed and tested. The results are as follows: First, negative customer feedback can stimulate problem-solving rumination, thus positively promoting career resilience. Second, negative customer feedback can simultaneously induce affective rumination in gig workers, but the negative depletion and mediating effect of this rumination on career resilience were not supported. Finally, occupation type (full-time/part-time) significantly moderates the relationship between negative customer feedback and affective rumination, and this relationship is stronger when the occupation type is full-time.