Provided are a pixel circuit, a display panel, a display device and a pixel driving method, the pixel circuit including: a data compensation circuit, a storage circuit, a driving transistor and a replication transistor, the replication transistor and the driving transistor have the same structure; the data compensation circuit writes, in an initialization stage, a first voltage into a first node under a control of a second control signal and a third control signal; and to write, in a data writing and compensation stage, under a control of the third control signal and a first control signal, a data voltage to a first electrode of the replication transistor to detect a threshold voltage thereof, write a compensation voltage to the first node for storage by the storage circuit, the compensation voltage being equal to a sum of the data voltage and the threshold voltage of the replication transistor.