The present application provides a positive electrode plate, a secondary battery and a power consuming device. The positive electrode plate comprises a positive electrode current collector, a positive electrode film layer provided on at least one surface of the positive electrode current collector, and a conductive undercoat layer between the positive electrode current collector and the positive electrode film layer, wherein the positive electrode film layer includes a positive electrode film layer comprising a positive electrode active material with a core-shell structure, the positive electrode active material comprises an inner core and a shell coating the inner core, and the conductive primer layer comprises a first polymer, a first water-based binder and a first conductive agent.