The embodiments of the present disclosure provide an array substrate, a display panel, a display apparatus and a current measuring method. The array substrate may include: a plurality of pixel units and sensing lines. Each of the pixel units may include a driving transistor, and the sensing line is configured to transmit an output of the driving transistor to a sensing device. At least two of the plurality of driving transistors may have their outputting terminals connected in series. Outputting terminals of adjacent driving transistors of the at least two of the driving transistors may be connected through a first switching element. At least one of the driving transistor of the at least two of the driving transistors may have an outputting terminal connected to the sensing line through a second switching element.