The edge data center is deployed near the user side to provide computing service for the increasing number of machine-type equipment. However, with the rapid development of Internet of Things (IoT), the number of services and demands are increasing nowadays. The differentiated reliability and delay requirements, as well as the complex communication network conditions under strong electromagnetic interference among multiple devices, make the task scheduling strategy affect the quality of service (QoS) of IoT services processing. This paper considers the communication network status of edge data centers. A task scheduling algorithm based on Differentiated Quality of Service (QoS)-Upper Confidence Bound (DQ-UCB) is designed. Delay requirements and reliability indicators are introduced into the exploration factor. Differentiated task scheduling policies are formulated to improve the reliability of transmission and reduce transmission delay, so as to ensure the normal operation of services.