A device and a method for processing a short message service are capable of high-reliably processing a short message service. The device for processing a short message service includes a plurality of access units and a plurality of service processing units, where each of the access units is connected to the plurality of service processing units. The access unit is configured to receive the short message service and send it to one of the service processing units, and send out the processed short message service from the service processing unit. The service processing unit is configured to process the short message service, and send out the processed short message service through one of the access units.