The invention relates to the technical field of a test for installed circuit boards, in particular to an automatic test system for a circuit board. The automatic test system for the circuit board comprises a central processing unit, text fixtures, an integrated circuit test (ICT) circuit board, a final circuit test (FCT) circuit board, and a switch board for achieving the conversion between a component level test and a board test. The central processing unit comprises an input unit, a control unit, and a data conversion output unit. The control unit is connected with the input unit and the data conversion output unit. One end of the switch board is connected with the text fixtures, and one end of the ICT circuit board and one end of the FCT circuit board are both connected with the other end of the switch board. The other end of the switch board, the other end of the ICT circuit board, and the other end of the FCT circuit board are all connected with the control unit. The automatic test system for the circuit board can test the component level and functionally test the circuit board at the same time, and therefore work intensity of testers can be reduced, efficiency is improved, and testing man-made errors are reduced. The practical value of the automatic test system for the circuit board is high.