The invention discloses an instant-message-based information printing method and an instant-message-based information printing system. The method comprises the following steps that a transmitting terminal externally transmits an instant message through a network; a receiving terminal receives the instant message through the network, processes the instant message, extracts printed information, and prints the printed information. According to the method and the system, an order can be remotely placed on line in a conventional emerging instant messaging way, and can be transmitted through a mobile communication network or the Internet, and the receiving terminal directly extracts contents of the order from the instant message as the printed information, and instantly prints the contents of the order through a printer without manually answering a purchasing telephone and manually recording the contents of the order, so that customer loss caused by the fact that a customer cannot get through and selects another merchant can be avoided, and the ordering efficiency is improved; in addition, manual answering and manual order information recording are not required, so that recording errors are effectively avoided, the accuracy of the contents of the order is ensured, the labor cost can also be lowered, and greater convenience is brought to the ordering of the customer.