A small form factor pluggable connector with a locking and unlocking mechanism is disclosed. The locking and unlocking mechanism includes a torsion spring mounted on a base, an actuator rotatably mounted on a cover, a rotating member rotatably mounted on the cover and the base, and a fastening shaft inserting into a cylindrical spring body of the torsion spring and shaft holes of the cover and the base. When the locking and unlocking mechanism is in an initial state or a locking state, a hook of the rotating member protrudes from a top surface of a front portion of the cover, and a spring-pressing portion of the rotating member presses a horizontal pin of the torsion spring. When the locking and unlocking mechanism is in an unlocking state, a handle of the actuator need be lifted up.