The invention discloses a combined type exposed corner protection piece. The combined type exposed corner protection piece comprises a top end protection piece body and a middle section protection piece body which are mutually matched, the top end protection piece body comprises a first top end protection plate and a second top end protection plate which are fixedly connected with each other, a connecting mechanism is arranged on one side of the first top end protection plate and the second top end protection plate, and a sticking protection plate used for sticking the interior wall is arranged on the other side of the first top end protection plate and the second top end protection plate; the middle section protection piece body comprises a first middle section protection plate and a second middle section protection plate which are fixedly connected with each other, and connecting mechanisms are arranged on the two sides of the first middle section protection plate and the second middle section protection plate respectively; the top end protection piece body and the middle section protection piece body are detachabley combined and connected by means of the connecting mechanisms. The combined type exposed corner protection piece is simple and convenient in structure, easy to install and high in applicability, and extremely high application and promotion value is achieved for wooden-structure residences.