The invention discloses a time-phased appointment registration system based on a multi-hospital registration source sharing pool. The time-phased appointment registration system comprises a central platform, a service provider platform, an HIS interface and a service provider interface. The united appointment registration platform registration source pool is established, multiple hospitals upload registration sources of the hospitals themselves to the registration platform registration source pool in a time-phased and week scheduling mode, a registration platform provides core registration service for multiple service providers, and each server can provide time-phased and accurate appointment registration service for users through a Web website, a Wap website, a mobile phone client side and a unified telephone hotline. Patients only need to go to the hospitals to keep an appointment and see doctors before the time when seeing the doctors if the patients make appointments to see specialists at the certain time in a certain day, patients are greatly facilitated, the united management and scheduling are achieved for the registration sources of the hospitals, the time-phased and accurate appointment registration service is provided for the users, and the united hospital-server provider-patient appointment service mode is created.