The disclosure relates to an assembled passenger conveying system, a method of assembling the same and a modularized device. The assembled passenger conveying system comprises at least two modularized devices, wherein the at least two modularized devices are detachably connected to form a loading area, and power are supplied from one or more modularized devices to drive the loading area to travel on a conveying path of the assembled passenger conveying system. By using the devices of the disclosure, passenger conveying systems can be assembled in a flexible and efficient manner according to field conditions, and also cost can be reduced and product competitiveness can be improved.