The utility model provides an alternating current/direct current integrated intelligent charging connecting device and a line connection selecting device thereof and belongs to the field of charging piles of electrical vehicles. The intelligent charging connecting device comprises a charging pile, a direct current charger, a single phase alternating current charger, a three-phase alternating current charger and a controller, an alternating current/direct current charging socket is arranged, the alternating current/direct current charging socket comprises direct current charging needles, single phase alternating current charging needles, three-phase alternating current charging needles, grounding needles and two auxiliary needles, the output end of the direct current charger, the output end of the single phase alternating current charger, the output end of the three-phase alternating current charger and the output end of the controller are in parallel connection to the direct current charging needles, the single phase alternating current charging needles, the three-phase alternating current charging needles and six auxiliary needles of the alternating current/direct current charging socket respectively through a make-and-brake device, and the make-and-brake device is provided with three switches. By means of the device, the number of charging piles matched with the electric vehicles can be increased, and the charging convenience is improved.