The invention discloses a photovoltaic module intelligent junction box comprising a main circuit, a voltage detection selection unit, a voltage detection unit, a control unit and a power supply unit.The main circuit comprises an output unit and a plurality of groups of input units. Each input unit comprises a first switch in series connection with a corresponding battery string, and a second switch in parallel connection with the battery string and the first switch; and the control unit is connected to the main circuit and is used to control the opening and closing of each switch. The presentinvention also discloses a control method correspondingly, including a detection method for short-circuit damage judgment of the second switch, which comprises steps of: S11, controlling the switching off of the second switch; S12, detecting the voltage Va across the second switch and the voltage Vcell of the battery string; S13, when Va is smaller than or equal to a first preset value, and Vcellis larger than n*Voc, n is the preset value, and Voc is the open-circuit voltage of a photovoltaic module, judging the second switch to be in the short-circuit damage state; and S14, controlling theswitching off of the first switch. The junction box and the control method of the invention all have the advantages of safety and reliability.