Prospective memory (PM) is vital for children to live independently. Theoretical and empirical evidence has shown that executive function (EF) plays an important role in children's PM. However, there is no EF training for the PM of school-age children. Therefore, a 4-week EF training programme was conducted in this study to investigate the transfer effects of training on event-based PM in 8- to 12-year-old children. Children were randomly assigned to the EF training or control groups. The results revealed that EF training was more effective in enhancing children's PM performance; in particular, there was a transfer effect of EF. Further findings suggested that this transfer effect was observed only in older children, which supported the magnification account that those with strong EF abilities profit most. Moreover, the benefits of training were predicted by inhibition and switching ability. Altogether, EF training has the potential to improve children's PM, especially for children with better EF.