A secure injection needle. An injection needle (1) consists of a needle hub (101) and a needle tube (102). The needle hub (101) is connected to a secure protective sleeve (2) by means of a flexible folding mechanism (4). Two symmetrical needle hub hooks (103) are provided on a side wall of the needle hub (101). Two symmetrical sleeve hooks (203) are provided in a hollow cavity of the secure protective sleeve (2). The two sleeve hooks (203) are engaged with the two needle hub hooks (103). Sleeve hook stop blocks (204) are provided on outer sides of the two sleeve hooks (203). By using the two needle hub hooks (103) provided on the side wall of the needle hub (101) and the two sleeve hooks (203) provided in the cavity of a secure protective sleeve (2), the injection needle achieves easy and convenient snap-fitting between the sleeve hooks (203) and the needle hub hooks (103)； the required thrust is only about 0.5 N, so that a single-hand operation can be achieved. By further providing the sleeve hook stop blocks (204) on the outer sides of the sleeve hooks (203), disengagement between the sleeve hooks (203) and the needle hub hooks (103) can be effectively prevented.
