A pixel circuit, driving method thereof, organic light-emitting display panel and display apparatus, comprise driving transistor, first storage capacitor, collecting unit, writing unit and light-emitting unit; the collecting unit is used for collecting the threshold voltage of the driving transistor and storing the threshold voltage into the first storage capacitor, under the control of the first scan signal; the writing unit is used for storing the data voltage inputted from the input terminal for the data voltage under the control of the second scan signal; and the light-emitting unit is used for emitting lights, driven by the data voltage and a voltage inputted from the input terminal for the controllable low voltage, under the control of the light-emitting control signal. Thus, the organic light-emitting device is not affected by the threshold voltage shift of the driving transistor, which may enhance the image uniformity of the organic light-emitting display panel effectively.