Emotion talk (ET), an emotion socialization practice theorized to promote children's emotion understanding and emotion regulation, has been linked to better socioemotional adjustment in diverse samples. Immigrant children face developmentally unique challenges and opportunities related to their multi-lingual and multi-cultural experiences. The present study aimed to identify sociocultural correlates of parent ET in two groups of low-income immigrant families with preschool-age children: Mexican American (MA) and Chinese American (CA) families. In 90 parent-child dyads (child age = 38 to 70 months, 59% girls; 46 Mexican American and 44 Chinese American) recruited from Head Start programs, parents' (mostly mothers') ET quality and quantity (i.e., use of emotion words, emotion questions and explanations, and overall elaborateness of ET) were coded from verbal transcripts of a shared picture book reading task. First, we found similarities and differences in ET across the two groups. Both MA and CA parents used emotion words, emotion questions, and emotion reasoning, whereas linking the story to personal emotion experience was infrequent. MA parents used more negative emotion words, emotion reasoning, and engaged in more elaborate ET than CA parents. Second, we examined the unique relations of multiple socio-cultural factors (SES, cultural orientations, parent and child demographics) to parent ET. Parent education and child age were associated positively with emotion questions, income was associated positively with emotion reasoning, and parents' heritage culture orientation was associated positively with the elaborateness of ET. The findings highlight the need to consider socio-cultural variations in emotion socialization practices when adapting and disseminating socioemotional learning interventions.