An OLED display panel and an encapsulating method of the same are provided. The OLED display panel includes a base substrate; an OLED device disposed on the base substrate; and a thin film encapsulating layer. The thin film encapsulating layer includes a first inorganic layer, an organic layer, and a second inorganic layer. The organic layer comprises a lower surface contacted to the first inorganic layer, an upper surface away from the first inorganic layer, and a plurality of side surfaces connected to the upper surface and the lower surface, an orthogonal projection of the upper surface projecting on the base substrate is disposed within an orthogonal projection of the lower surface projecting on the base substrate, and each of the plurality of side surfaces is inclined.