An OLED display panel and a method of encapsulating the same, and a display device are disclosed. The OLED display panel includes: a first substrate and a second substrate which are disposed oppositely, a first sealing agent, a second sealing agent and a plurality of barrier blocks. The first sealing agent is provided between the first substrate and the second substrate and forms a sealing space with the first substrate and the second substrate; the second sealing agent is filled in the sealing space formed by the first substrate, the second substrate and the first sealing agent; and the plurality of barrier blocks are disposed in the sealing space formed by the first substrate, the second substrate and the first sealing agent and are arranged along the first sealing agent at an interval.