Disclosed are a pixel circuit, an organic light emitting display panel and a display apparatus. The pixel circuit comprises a light emitting device (01), a charging module (02), a driving module (03), and a testing module (04) having a control terminal connected to a test signal terminal (TEST) for providing a test signal switching between a displaying period of time and a testing period of time, a second input terminal (a2) connected to an output terminal of the light emitting device (01), and a third output terminal (b3) connected to a second reference signal terminal (Ref2). Through the pixel circuit, a current signal for driving the light emitting device (01) to emit light can reach the uniformity standard so that display luminance of pixels is uniform and quality of a display picture is ensured.