The invention provides a telecom customer service method based on a block chain. The method comprises the steps that S1, a plurality of telecom customer service participants serve as nodes of one block chain respectively and are connected with one another to jointly form an alliance chain; S2, when the customer service personnel receives the customer complaints for the first time, the alliance chain automatically generates a unique complaint number; Complaint information is recorded on an account book of the alliance chain, and all nodes in the alliance chain can look up the complaint information. According the trust-free, mediation removal, non-talkable, Traceable characteristics of the block chain in the sharing environment,, Build a trustworthy, traceable, and non-tamperable customer service process data sharing and tracing system to share and handle complaints between customers, customer service personnel, network management systems, business systems, expert teams, and even vendorsand friends. The process is transparent, the process can be traced, the responsibility for processing can be traced, and the overall service capability of the telecommunications industry can be improved..