The invention relates to a water pump controller testing system and an IP address self-setting method. The IP address self-setting method comprises the steps of: 1, arranging water pump controllers to be tested in a testing cabinet, and connecting a circuit; 2, identifying a row number of the current water pump controller to be tested through a testing cabinet row number identification circuit; 3, identifying position numbers of the water pump controllers to be tested in the row through a testing cabinet position number identification circuit; 4, completing IP addresses of all the water pump controllers to be tested, and turning on an upper machine; 5, sending a broadcast command of acquiring the IP addresses by the upper machine; 6, sending IP=i+j of the water pump controllers to be tested to the upper machine; 7, and establishing a test database of the water pump controllers to be tested when the upper machine acquires the IP addresses. The IP address self-setting method adopted for setting the IP addresses of equipment of the testing system has the advantages of simple structure, high reliability, high practicability and the like, can rapidly and effectively solve the problem that the IP addresses and the position numbers are inconsistent, and provides a new scheme for the field of equipment networked address assignment.