A kind of syringe protection jacket of what is closed in this creation system, comprising: an engagement cylinder, the engagement cylinder are equipped with an accommodation groove； And a shielding plate, the shielding plate system connect one end of the what engagement cylinder, and are equipped with one and plug hole with what the accommodation groove was connected, in the outer rim for the another side which connects the engagement cylinder and are formed with a flange. By the syringe protection jacket of this creation, can what using syringe when needle sticks produced when avoiding back set.本創作係關於一種注射器保護套，包括：一接合筒體，該接合筒體設有一容置槽；以及一遮擋片，該遮擋片係連接於該接合筒體之一端，並設有一與該容置槽相連通之插設孔，該遮擋片於連接該接合筒體之另一面之外緣上並形成有一凸緣。藉由本創作之注射器保護套，可於使用注射器時避免回套時所產生之針扎危險。
