The invention discloses an interactive online foot measurement system, which mainly promotes business activities between shoe factories, shoe stores and consumers in an interactive manner, and the more specific result is to allow consumers to obtain tailor-made shoes First, the shoe factory builds the last database based on the existing last size, the shoe store builds the shoe shape database and the shoe sample graphic library based on the shoe goods in stock, and the shoe store uses measuring instruments to measure the actual size of the consumer's feet , the measuring instrument transmits the signal to the man-machine interface in a synchronous connection to make personal last data, the measured last data can be converted into shoe size, and compared with the last database for query and comparison, if there is a matching The last can quickly call up the qualified shoe shape information through the shoe shape database, and immediately display the shoe shape graphics through the man-machine interface for consumers to use as a reference for purchase. Last size, the personal last data can be transmitted to the shoe factory, so as to make shoe lasts and shoes that completely fit consumers.