The comprehensive performance testing bench for instant electric water heaters is designed and developed based on the relevant testing requirements of QB/T 1239-1991 "Fast Heating Electric Water Heaters" and GB_4706 [1]. 11-2008 "Special Requirements for Fast Heating Electric Water Heaters for Household and Similar Electrical Appliances". It is a testing instrument and equipment specifically designed for the comprehensive performance testing of instant electric water heaters. The main testing items include: electrical parameters, safety regulations testing, startup water flow testing, water pressure withstand testing, water temperature testing, temperature control protection testing, etc. Adopting PLC industrial computer control method, it can carry out project programming operation, process automatic detection, data tracking and collection, conclusion discrimination and classification, automatic storage of detection data, which is convenient for future search, analysis, statistics and printing