The invention provides a self-insulation corner block and a self-insulation block corner wall built by using same. The two side faces of the self-insulation corner block are separately connected witha plane block in a clamping way so as to form a leather of corner wall body; the upper leather of corner wall body is connected with the lower leather of corner wall body in a clamping way; vertical pouring bins of the upper leather of corner wall body and the lower leather of corner wall body are connected with each other in a communicating way; the vertical pouring bins are internally provided with vertical reinforcing steel bars, and is poured with grout concrete; an arc-shaped groove between the upper leather of corner wall body and the lower leather of corner wall body is internally provided with horizontal reinforcing steel bars; a closed hoop rib is arranged at a bayonet of a corner of the corner wall body; building blocks of the upper leather of corner wall body and the lower leather of corner wall body are in overlap joint in a staggered way. The corner block is arranged at the corner, and the self-insulation building block corner wall is formed by means of the structure processing grout concrete and the configured reinforcing steel bars, so that the wall body does not need a formwork, the difficulty of site construction is reduced, the cost is lowered, and the efficiencyof site construction is increased; furthermore, the thermal insulation property is improved, and the integrated construction of thermal insulation and a whole structure is realized.