The invention discloses an assistant detection method and system for an electrical appliance connector of a vehicle. The method comprises a step of receiving a retrieval instruction inputted by a user and sending the retrieve instruction to a server such that the server retrieves electrical appliance connector information according to the retrieval instruction, a step of receiving electrical appliance connector information fed by the server so as to judging whether an electrical appliance connector is a target electrical appliance connector according to the electrical appliance connector information, a step of sending a detection detail request to the server further if so such that the server calls detection detail of the target electrical appliance connector according to the detection detail request, wherein the detection detail comprises detail detection tools and electrical parameters corresponding to each pin in the electrical appliance connector, and a step of receiving the detection detail fed by the server and presenting the detection detail to the user. According to the method of the invention, convenience can be provided for the detection of the electrical appliance connector, the difficulty of the maintenance of automobile electrical appliances is reduced, and the maintenance efficiency and accuracy rate are improved.