A modular type motor-driven vehicle includes a front half module, a rear half module and a retainer unit. The front half module includes a front vehicle frame, a front vehicle body shell disposed fixedly on the front vehicle frame, and a seat disposed fixedly on the front vehicle body shell. The rear half module includes a rear vehicle frame, a rear vehicle body shell disposed fixedly on the rear vehicle frame, and a driving unit disposed between the rear vehicle frame and the rear vehicle body shell. The retainer unit includes an engaging member connected fixedly to the front half module, a handle unit disposed on the rear half module, a hook member biased to engage the engaging member so as to retain the front half module on the rear half module. The handle unit is operable so as to disengage the hook member from the engaging member.