The invention discloses a small invoice sealing machine and belongs to the technical field of automatic office equipment. The technical problems that an existing automatic sealing machine is large in occupied area and assembly and installation are troublesome are solved. The small invoice sealing machine comprises a first conveying mechanism used for conveying first page invoices, a second conveying mechanism used for conveying second page invoices, a third conveying mechanism used for conveying third page invoices, a first diving mechanism used for driving the first conveying mechanism, the second conveying mechanism and the third conveying mechanism, a first control device used for controlling the first diving mechanism to operate intermittently, a sealing mechanism used for sealing the second page invoices and the third page invoices, a first gathering mechanism used for gathering the first page invoices, and a second gathering mechanism used for gathering the second page invoices and the third page invoices. The first gathering mechanism is located above the second conveying mechanism and the third conveying mechanism. The first conveying mechanism is arranged obliquely, and the tail end of the first conveying mechanism is higher than the head end of the first conveying mechanism.