The invention discloses a flexible contact type IC book/certificate, a reading and writing machine and an upgrading method of old equipment. A discrete large-contact-surface flexible IC micro module is arranged at an original magnetic stripe area of a back cover of a papery flexible book/certificate. The flexible IC micro module consists of a flexible substrate, a small IC piece and at least 5 contact surface circuits. The contact surface circuits include contact convex surfaces and flexible connection circuits; conducting films are formed at the surfaces of the contact convex surfaces and protrude from the flexible connection circuits outwardly; and the small IC piece and the contact surface circuits are distributed on the flexible substrate horizontally in a manner of mutual separation and insulation of each two conducting films. When modification or newly manufacturing in an IC reading machine, a reading-writing module of the large-contact-surface e IC micro module is installed and is used for identification as well as reading and writing; and the reading-writing module is used for replacing an original magnetic head for upgrading in a self-service passbook board device with an original magnetic stripe mode. A technical basis is provided for a passbook type book/certificate for keeping statement record characteristics and information access and using a secure and reliable contact type IC scheme.