The invention is applicable to the information technical field and provides a method, system and device for printing an invoice. The invoice contains a first black label and a second label. The method of the invention comprises the following steps: when express personnel receive messages, a communication terminal receives and stores the input customer information; an input command of printing theinvoice is received, the customer information is sent to a printer through a network, the printer is controlled to print the customer information on the invoice; when the printing position of the printer is located to the first black label of the invoice, a command of adding one to the invoice number is sent to the communication terminal; the communication terminal adds one to the prestored invoice number; and when the printing position of the printer is located to the second black label of the invoice, the communication terminal receives an input modify command to ensure that the invoice number stored in the communication terminal is equal to the invoice number on the invoice. By using the method of the invention, when a customer loses an invoice, the corresponding invoice number can be found through a waybill number.