A safety syringe includes a main body, an injection needle, a carrying base and a limiting unit. A groove is formed on the main body. The injection needle includes a first needle part and a second needle part bent relative to the first needle part. The carrying base is rotatably arranged on the main body, for carrying the injection needle. When the carrying base is located at a first position, the second needle part is exposed outside the main body, and when the carrying base is located at a second position, the second needle part is accommodated inside the groove. The limiting unit is movably arranged on the main body. The limiting unit includes a first limiting part and a second limiting part for respectively stopping the carrying base from rotating relative to the main body when the carrying base is located at the first position and the second position.安全注射裝置包含一本體、一注射針、一承載座以及一限制單元。該本體上形成有一凹槽。該注射針包含一第一針部以及一第二針部相對該第一針部彎折。該承載座以可轉動之方式設置於該本體上,用以承載該注射針,當該承載座位於一第一位置時,該第二針部是外露於該本體,當該承載座位於一第二位置時,該第二針部被容置於該凹槽中。該限制單元以可移動之方式設置於該本體上,該限制單元包含一第一限制部用以於該承載座位於該第一位置時阻止該承載座相對該本體轉動,以及一第二限制部用以於該承載座位於該第二位置時阻止該承載座相對該本體轉動。100‧‧‧安全注射裝置110‧‧‧本體111‧‧‧第一凹陷結構112‧‧‧本體第一端113‧‧‧通道114‧‧‧本體第二端115‧‧‧固定結構116‧‧‧第一凹槽118‧‧‧第二凹槽120‧‧‧注射針122‧‧‧第一針部124‧‧‧第二針部130‧‧‧承載座132‧‧‧第一卡合結構140‧‧‧限制單元142‧‧‧第一限制部143‧‧‧第二凹陷結構144‧‧‧第二限制部145‧‧‧第二卡合結構146‧‧‧連接部
