Disclosed in the present invention are a method and a system for a cash register to test a kitchen printing function. The method comprises: a cash register acquiring ordering information, generating kitchen printing order information, sending the kitchen printing order information to a server in which a kitchen printing simulation system is installed, the kitchen printing simulation system receiving and storing the kitchen printing order information, and determining, by means of an order number generation rule, whether an order has been lost during kitchen printing. The present invention replaces a kitchen printer with a kitchen printing simulation system, wherein a cash register can send kitchen printing information to the kitchen printing simulation system after ordering has been performed, the kitchen printing simulation system analyzes, by means of an order number generation rule, whether an order has been lost, thereby realizing verification of whether an order has been lost during kitchen printing and replacing manual detection, greatly reducing resource investments, i.e., reducing the cost of the entire stress test. Moreover, automatic detection is more efficient and accurate than manual detection.