Screw locking tool

A screw locking tool comprising:

• a main body provided with a shank and a sleeve, said shank having front end continually connected to said sleeve, said sleeve formed with an accommodating cavity in a central interior axially, and an insert holes communicating with said accommodating cavity, said insert holes respectively fixed therein with a positioning steel ball, said accommodating cavity having an elastic element set therein;
• a screwing element received in said accommodating cavity of said sleeve, said screwing element provided with a shank, said shank disposed with an annular recess for matching with operation of said positioning steel balls of said sleeve, said screwing element formed with a receiving groove for receiving a head of a screw, said receiving groove having annular wall bored with a plurality of insert holes respectively for fixing a positioning steel ball, said annular wall of said receiving groove provided with an annular recess fitted therein with an O-shaped ring for restricting a moving distance of said positioning steel balls;
• a screw provided with a head, said head of said screw disposed with an upper annular wall and a plurality of recessed slots located under said upper annular wall;
• and
• said positioning steel balls in said receiving groove of said screwing element respectively engaged in said recessed slots of said screw head when said screw head is combined with said receiving groove of said screwing element, said screwing element able to fully fix said screw in place to let said screw not slip off, facilitating to carry out screw locking work.