The utility model discloses a life -span evaluation device who divides closing coils, include: proof box, host computer module, master control circuit module, data acquisition module and control module, wherein, the master control circuit module is connected respectively the host computer module data acquisition module with control module, the proof box with control module connects, the master control circuit module is used for the basis the host computer module is set for predetermines data adjustment control module's control parameter, so that control module is right according to control parameter the parameter regulation and control are carried out in the proof box, and then make the operation of reversal salt atmosphere test is carried out to minute closing coils to the proof box. Cansimulate climatic conditions, effectively obtain branch closing coils's life -span aassessment information, in time change and divide closing coils.