The present disclosure provides a display panel, its controlling method and a display device. The display panel includes a plurality of pixel units, a plurality of gate scanning lines arranged on a display substrate and a plurality of data lines arranged on the display substrate and crossing the gate scanning lines. Each pixel unit includes a data writing module, a driving module and a light-emitting element. The data writing module is configured to apply a data voltage to the driving module under the control of a current-level gate scanning signal, and the driving module is configured to drive the light-emitting element to emit light in accordance with the data voltage. The data writing modules of N adjacent pixel units in an identical row are connected to an identical data line, and N is an integer greater than 1. The data voltage across the data line is applied to the data writing modules of the N adjacent pixel units in a time-division manner under the control of the current-level gate scanning signal.