The present disclosure provides a pixel circuit and a driving method thereof, a display panel and a display device. The pixel circuit includes a switching circuit, an inverter, a potential maintaining circuit, and a charging circuit, the switching circuit writes data voltage signal into a first node under control of scanning signal, the first node is connection node of the switching circuit, the inverter, the potential maintaining circuit and the charging circuit; the inverter inverts potential of the first node and outputs inverted potential to a second node, the second node is connection node of the inverter and the charging circuit; the potential maintaining circuit maintains potential of the first node in response to the switching circuit being turned off; and the charging circuit controls display of a display unit according to potential of the first node and potential of the second node.