The invention discloses a remote self-service dinner seat selection system based on an infrared sensor. The system comprises a mobile phone client, a predetermined seat selection system and the infrared sensor, wherein the mobile phone client is connected with the predetermined seat selection system, and the input end of the predetermined seat selection system is connected with the infrared sensor; the infrared sensor performs real-time monitoring in a restaurant, determines seat information in the restaurant and feeds back the seat information to the predetermined seat selection system, the predetermined seat selection system updates the seat information of the restaurant in real time, and the mobile phone client remotely acquires the seat information of the restaurant via the predetermined seat selection system, and then predetermines a seat needed by a customer. According to the system provided by the invention, the seats can be remotely predetermined, complaint of the customers is reduced, and queuing time is reduced; then real-time monitoring and real-time update can be achieved, order missing and battles for seats are effectively avoided, accurate positioning and self-service seat selection are performed, the workload of waiters for guiding the customers to the seats is reduced, and favorite positions of the customers can be remotely selected, and dinner experience of the customers is enhanced.