A high-quality parent-child relationship is critical to the health and well-being of adolescents and, in the family system, the interaction pattern within couples is a decisive factor in parent-adolescent relationship quality. Using dyadic data from 441 Chinese couples, in this study, we examined the association between partner phubbing (a negative interaction behavior initiated by the spouse) and parent-adolescent relationship quality, and further explored the moderating effect of adolescent gender. Dyadic modeling showed that partner phubbing had both an intra-person effect and an inter-person effect on parent-adolescent relationship quality. For the intra-person effect, husbands' phubbing had an adverse effect on the mother-adolescent relationship quality, and this effect was stronger for girls than boys; wives' phubbing had a positive effect on the father-adolescent relationship quality, but this effect was only significant for boys. For the inter-person effect, the negative influence of husbands' phubbing on father-adolescent relationship quality was only significant for boys; wives' phubbing was uncorrelated with mother-adolescent relationship quality. These findings deepen our understanding of the links between the marital subsystem and the parent-adolescent subsystem in the family, underscore the importance of positive marital interactions for adolescent development, and have implications for personal smartphone use management in family contexts.