The invention discloses a leather shoes customizing method and system. The customizing method includes the steps of S1, collecting foot information of a user by a user terminal and generating a foot model according to the foot information; S2, selecting target leather shoes by the user, generating and displaying try-on information by combining the target shoes with the foot model and transmitting the try-on information to a designer terminal; S3, when the designer terminal monitors that shoes elements of the target shoes in the try-on information are modified, calculating the type version of the target shoes, generating the adjusted target shoes, generating adjusted try-on information by combining with the foot model and sending the adjusted try-on information to the user terminal; S4, inputting feedback opinions by the user at the user terminal, if the user is satisfied, completing leather shoes customizing, or otherwise, returning the feedback opinions to the designer terminal and executing the step S3. Through try on of the foot model, precision in measurement can be improved; the user participates in customizing in real time, cost in offline repeated modification is saved, leather shoes customizing efficiency is improved, and high practicability is achieved.