Suicidal ideation is a prominent public health problem among junior middle school students. Previous researchers have explored the influence of parenting style on adolescents' suicidal ideation, but few researchers distinguished the influence of positive and negative parenting styles. The mediating effect of negative emotions between negative parenting styles and suicidal ideation and the moderating effect of hope among Chinese junior middle school students were focused on in this study. 877 junior middle school students in Hunan, Anhui, and Jiangxi provinces in China were investigated with the simplified Parenting Style Questionnaire, Positive and Negative Affect Schedule, Children's Hope Scale, and Self-rating Idea of Suicide Scale. The theoretical models were tested through the PROCESS macro for SPSS. The results showed that: (1) Negative parenting styles had positive effects on suicidal ideation. (2) Negative emotions mediated the relationship between negative parenting styles and suicidal ideation. (3) Hope moderated the relationship between negative emotions and suicidal ideation. This study implies that we could start by improving adolescents' negative parenting styles and raising their level of hope to prevent and intervene in adolescents' suicidal ideation.