The present invention relates to a safety catheter assembly. One aspect of the present invention provides a safety catheter assembly which comprises: a catheter having a tube； and a needle assembly, wherein the needle assembly comprises: a housing which is detachably coupled to the catheter； a handle member which is provided to be movable forward and backward within the housing； a needle which is mounted on the handle member； a fixing member for fixing the handle member to the housing in a forwardly moved position of the handle member when the handle member is forwardly moved such that the needle is exposed to the outside by passing through the catheter； and an elastic member for backwardly moving the handle member such that the needle is inserted into the housing when the handle member is released from the fixed state.
