The disclosure discloses a sofa backrest connection structure, including a first member and a second member, the first member includes a first base plate, two guide rails symmetrically arranged on the first base plate, and a limiting part arranged on the first base plate, and the limiting part is provided with a clamping protrusion; the second member includes a second base plate and a first horizontal plate connected to the second base plate, the second base plate includes an insertion part, and the insertion part is provided with a clamping hole matched with the clamping protrusion; after the insertion part is slidably inserted into and fitted with the two guide rails, the clamping protrusion is clamped in the clamping hole; and the first horizontal plate is used for being connected with a sofa seat frame, and the first base plate is used for being connected with a sofa backrest.