The invention discloses an online comprehensive service system for electric automobiles. The online comprehensive service system comprises a clustered repair control center, a plurality of repair control terminals and a plurality of electric automobile part manufacturing factory terminals. The repair control terminals and the electric automobile part manufacturing factory terminals are connected to the clustered repair control center through a communication network to exchange information. When electric automobiles need repairing at the repair control terminals, the clustered repair control center, based on the fault detection result of the electric automobiles, connects the repair control terminal to the electric automobile part manufacturing factory terminal with problem parts. Finally, the technicians at the electric automobile part manufacturing factory terminals guide the working staff at the repair control terminals to complete the repair work to the electric automobiles. The service system of the invention is capable of online detecting faults and remotely controlling repair robots and capable of integrating online repair guidance and skill training into one. Further, with such a service system, the problem of shortage of technicians can be overcome and online teaching can be given to electric automobile repairmen.