A reversible wrench comprising: a main body that includes a first working portion that is provided with an assembly hole and a control hole, whereat the assembly hole and the control hole communicate with each other by means of a curved braking toothed slot located between the assembly hole and the control hole; and a second working potion; a control member having a handle, and a shaft at which a step-shaped clearance hole is radially arranged and that is mounted in the control hole; a braking toothed member that is mounted in the curved braking toothed slot and having a curved toothed portion formed on one end thereof facing the assembly hole; a recessed curved slot set on the other end thereof facing the control hole; a link shaft mounted in the recessed curved slot and connected to the braking toothed member by an axial pin; and an elastic member slipped on the link shaft; and a ratchet member that is mounted in the assembly hole of the first working portion and including an external toothed portion formed on an outer surface thereof and used for being engaged and moved with the curved toothed portion of the braking toothed member; and a tool hole formed on the inner diameter of the ratchet member. a main body that includes a first working portion that is provided with an assembly hole and a control hole, whereat the assembly hole and the control hole communicate with each other by means of a curved braking toothed slot located between the assembly hole and the control hole; and a second working potion; a first working portion that is provided with an assembly hole and a control hole, whereat the assembly hole and the control hole communicate with each other by means of a curved braking toothed slot located between the assembly hole and the control hole; and a second working potion; a control member having a handle, and a shaft at which a step-shaped clearance hole is radially arranged and that is mounted in the control hole; a handle, and a shaft at which a step-shaped clearance hole is radially arranged and that is mounted in the control hole; a braking toothed member that is mounted in the curved braking toothed slot and having a curved toothed portion formed on one end thereof facing the assembly hole; a recessed curved slot set on the other end thereof facing the control hole; a link shaft mounted in the recessed curved slot and connected to the braking toothed member by an axial pin; and an elastic member slipped on the link shaft; and a curved toothed portion formed on one end thereof facing the assembly hole; a recessed curved slot set on the other end thereof facing the control hole; a link shaft mounted in the recessed curved slot and connected to the braking toothed member by an axial pin; and an elastic member slipped on the link shaft; and a ratchet member that is mounted in the assembly hole of the first working portion and including an external toothed portion formed on an outer surface thereof and used for being engaged and moved with the curved toothed portion of the braking toothed member; and a tool hole formed on the inner diameter of the ratchet member. an external toothed portion formed on an outer surface thereof and used for being engaged and moved with the curved toothed portion of the braking toothed member; and a tool hole formed on the inner diameter of the ratchet member.