<p>Numerous studies have shown that people believe repeated information is more true than new information regardless of its veracity, which is referred to as the illusory truth effect. Furthermore, retrieval from memory in the absence of explicit repetition also could give rise to an illusory truth effect. It is constructive to explore how mnemonic accessibility affected the illusory truth from both sides of the accessibility continuum: enhancement and suppression. The current study explored the effect of source credibility of emotional statements on the illusory truth effect from both mnemonic enhancement and suppression in two experiments. In Experiment 1 and Experiment 2, the source credibility was respectively manipulated by explicitly informing participants and asking participants to subjectively rate them. Our results showed that retrieval practice of statements enhanced the memory for the mentioned statements, while impaired the memory for the unmentioned but related statements. Further, the mentioned statements (mnemonic enhancement statements) became more believable, but the unmentioned but related statements (mnemonic suppression statements) did not change in their truth. Additionally, the effect of two ways of getting the information of source’s credibility on the illusory truth were modulated by the emotionality of statements. These findings not only highlighted the relationship between memory and the illusory truth effect, but also revealed the effect of different ways of getting the information about source credibility and emotionality of statements on the illusory truth in a social interaction setting, which are conductive to attenuating propagation of the illusory truth for false information in the population and improving the public’s truth discernment.</p>