The invention discloses a 95598 call center pressure test system and method based on SIP relay. The method comprises the following steps: connecting an SBC session border control module of a call center, and establishing SIP-based on-line communication with the call center; establishing four test items based on load type of the call center, call center service flows corresponding to the four test items being: SBC-IVR/CTI, SBC-IVR/CTI-Alcatel OXE-manual service agents, SBC-IVR/CTI-service query and hybrid service, and establishing a corresponding test script for each test item; carrying out the test scripts in mass, establishing a big user call concurrent call-incoming call center, and receiving response returned by the call center, and monitoring operating state of each path of communication; and according to the operating states of all communications, obtaining performance index of each test item. The platform performance indexes of the call center under different load models can be measured through the method, and the system and method provide powerful support for performance bottleneck analysis and upgrading and reconstruction of the 95598 call center.