With the extensive application of infrared thermography in the field of nondestructive testing,the thermal excitation technology,as one of the basis of its application research,has attracted extensive attention.In view of the disadvantages of the traditional high-power thermal excitation equipment,such as single working mode,large volume and not easy to carry,the traditional thermal excitation source is designed and reformed,and a new portable multi-mode non-destructive testing thermal excitation source is designed and developed,which can realize three excitation modules:lock-in module,lock-in multi-frequency module and pulse module,and module parameters can be adjusted.The thermal excitation source is powered by 24 V lithium battery with the output power up to 1000 W.It has the characteristics of flexible operation,easy to carry and multi-mode,which can meet the requirements of non-destructive testing of infrared thermography.