The invention discloses a management system and a management method of sales contract. The management system comprises a server unit, an information maintenance unit, a sales unit, a contract generating and saving unit, a contract signing unit, a B / S inquiry unit and a contract checking and printing unit. Techniques of network, computer, communication, mobile equipment, two-dimensional code encryption, digital signature and the like are integrated with the management system and the management method fully. Electronic contract is generated by calling an enterprise information system, is subjected to two-dimensional code encryption and digital signature to avoid being counterfeited, tampered and repudiated, and can be checked and printed and the like. Since iron and steel product contract is generated automatically, signed and printed by customers themselves, accuracy, real-time performance, effectiveness, unlimited location of iron and steel product contract generation are improved, steel product circulation efficiency is improved, and integral informatization level and list sales service level of the iron and steel industry are increased. In addition, security and reliability of the electronic contract are guaranteed by the two-dimensional code encryption and digital signature techniques.