The invention discloses an automatic charging 
system of an electric car and a control method of the automatic charging 
system. The automatic charging 
system and the control method thereof have the advantages that monitoring is started from parking of the car, a charging connection reset device is disconnected after charging of the car, a user's bill is generated, charging plug 
butt joint and real-time charging process monitoring are included, all related data in the whole charging process are monitored by a 
software system portion, a hardware mechanical portion is controlled to complete a next action, the hardware portion sends new 
semaphore to the 
software portion for new command calculation after completing a command, the 
software portion is combined with the hardware portion, and accordingly, systematicness and intellectuality of the whole charging system are improved; a charging interface 
butt joint scheme based on 
machine vision and a 
machine learning 
algorithm is applied, and feasibility and accuracy in 
butt joint are guaranteed; a three-dimensional lead screw guide rail mechanism with a long 
stroke is used, the range of activity of a charging connector is widened, and the charging connector is suitable for multiple car models; the automatic charging system is provided with a 
payment code 
scanner, 
payment of related charges can be completed through a 
payment bar code scanning function of a cellphone-side payment application, and accordingly, intelligent payment is achieved.