This study examined the effect of an intervention on coping knowledge among fifth- and sixth-grade elementary schoolchildren who received smartphone-delivered emergency preparedness education. This was a quasi-experimental study using a pre-/posttest design. Eighty-six children were recruited to participate. The children in the experimental group (n = 44) received smartphone-delivered emergency preparedness education while those in the control group (n = 42) received traditional lecture-centered education. Data were analyzed using a repeated-measured analysis of variance. Subsequently, the experimental group scored significantly higher than the control group on coping knowledge (F = 7.96, f = 0.31, p = 0.010). The use of technology such as smartphone-delivered emergency preparedness education may be effective to improve their coping knowledge of fifth- and sixth-grade elementary schoolchildren.