Provided are a pixel circuit and a method for driving the same, a display panel and a display device. A drive circuit (04) in the pixel circuit is capable of controlling conduction/non-conduction between a second node (N2) and a third node (N3) under the control of a potential of a first node (N1). A light-emission control circuit (03) in the pixel circuit is capable of controlling conduction/non-conduction between a cathode of a light-emitting element and a second node (N2), and controlling conduction/non-conduction between the third node (N3) and a pull-down power terminal (LVSS) under the control of a potential of a light-emission control signal; and a potential of the first node (N1) is not be affected by a potential of an anode of the light-emitting element. Furthermore, in the case that the cathode of the light-emitting element and the second node (N2) are conducted, the second node (N2) and the third node (N3) are conducted, and the third node and the pull-down power terminal (LVSS) are conducted, the light-emitting element can emit light reliably.