The invention discloses a government procurement transaction management system. The system includes a plan management subsystem, an electronic evaluation subsystem, an agreement and fixed-point procurement subsystem, a contract management subsystem, a supervision and early-warning subsystem, a honesty system subsystem, a data analysis and decision support subsystem, an information service portal subsystem, an agency library, an evaluation expert library, a supplier library and a commodity information library. According to the system, transaction efficiency is improved through online procurement, transaction costs are reduced, energy saving, emission reduction and green procurement are realized, a bid-inviting and procurement industry technology structure is improved, and remote bid evaluation is facilitated; transaction object and subject behaviors are stereoscopic, transparent, comprehensive and dynamic, a bid evaluation process is more secure, real and reliable, bid-inviting data archiving is facilitated, and traceability is a basis of market subject honesty and self-discipline; and transaction manners are regulated, supervision manner changing is promoted, and stereoscopic supervision of administrations, industries and the public is realized to effectively curb and eliminate falsification behaviors and transaction behaviors of monopoly, illegality and the like.