The utility model provides an automatic spraying electrical system for taking turns drag chassis, the utility model discloses the complete machine serial number of utilizing every round of RFID equipment record to drag the chassis is selected the four big parts spraying orbits on chassis and is numbered through the database, and number according to the spraying orbit and make up into the automatic spraying orbit on this chassis with each some spraying orbit, the automatic subregion spraying of control machine people, spraying orbit combination spraying mode strong adaptability satisfies the promptness that thousands of kinds of model collineation were produced, in addition, spraying orbit in chassis is automatic to be made up data and still is provided with the interlocking with robot automatic subregion spraying between automatically controlled, the control, and the mistake proofing measure can solve the automatic data mistake that makes up of chassis spraying orbit reliably and result in shower nozzle and chassis work piece to bump against the problem that results in equipment to damage, and working method is simply workably, and performance safe and reliable has fine use value