A mini-scale coaxial connector includes a board end connector fixed on a PCB, and a cable end connector, with an overall thickness not over 0.8 mm; the board end connector including a frame member, a cramp ring, and an attachment member; the cable end connector connected with a cable and including a casing member and a mask member; the frame member including an engagement ring groove and a locking protrusion; the engagement ring groove disposed on the frame member; the locking protrusion disposed on two lateral sides of the frame member; the cramp ring formed in a semi-circular shape, with two ends thereof passing through the frame member with an axle; the cramp ring rotating about the axle; the cramp ring including an engagement position; the attachment member disposed on the cramp ring; the mask member and the casing member combined, with a cable terminal engaged therebetween.