The invention discloses a temporary parking space renting system and a temporary parking space renting method. The renting system comprises a system server, a database server, a short message sending server, call center voice response equipment, a fixed parking space owner client for entrusting a third party to manage, a third party client for management, a temporary parking main client and a background management client, wherein the database server, the short message sending server and the call center voice response equipment are connected with the system server respectively. The renting method comprises renting entrustment, renting transaction, temporary renting and renting management. The attached equipment is simple; the operation can be mastered once learning; and the system and the method are easily popularized at property management places or parking lots of all fixed parking spaces, and are particularly suitable to be widely applied in large and medium cities lacking the parking spaces in a short term so as to propel sharing of social idle parking space resources, increase the usage frequency and efficiency of the parking spaces, reduce the time for seeking the parking spaces for temporary parking owners, effectively solve the parking problem of going to work and handling affairs and basically solve the dispute problems of the fixed parking owners and the temporary parking owners due to parking time conflicts.