The invention relates to a cover type safety device for an injection needle, which comprises a first buckle seat and a second buckle seat which can be relatively combined, and a cover which can be combined with the first buckle seat and can swing. The first buckle seat and the second buckle seat are clamped and positioned on the needle seat of an injection needle. The cover can swing between the first position and the second position, and can also be limited to the third position. The cover at the third position completely covers the needle body of the used injection needle, so as to avoid its exposure and stabbing others.一種注射針之護蓋式安全裝置，包括可相對結合之第一扣座和第二扣座，以及結合於該第一扣座且可擺動的護蓋。該第一扣座和第二扣座夾制定位於一注射針之針座，該護蓋可於第一位置、第二位置之間擺動，亦可被限止於第三位置，該第三位置之護蓋徹底的遮蔽了已使用之注射針的針體，避免其顯露而戳傷他人。
