A modular data center includes a plurality of first containers and a plurality of second containers. The plurality of first containers and second containers are partitioned into a plurality of functional modules respectively, the functional modules of the plurality of first containers being arranged in parallel, and the functional modules of the plurality of second containers being arranged in parallel on one side of the plurality of first containers and corresponding to the functional modules of the plurality of first containers respectively. The present disclosure combines the functional modules of the plurality of first containers and the plurality of second containers into modular data centers with different forms, capacities, and data center usability tiers, and the assembly of the plurality of first containers and second containers with standardized sizes may facilitate the transportation and reduce the time and cost of assembling and delivery of the modular data center.