The renewal will see the teen drama starring Shailene Woodley, hit its 100th episode.
The network also picked up two new shows for its lineup including a half-hour comedy and an unscripted docu-series.
Multi-camera series Baby Daddy will star Chelsea Kane and Tahj Mowry and will follow a man who suddenly becomes a father when a baby is left on his doorstep by an ex-girlfriend.
Meanwhile, Beverly Hills Nannies will be a reality series produced by Real Housewives of Orange County's Evolution Media.
Both series will enter production in the spring and are expected to air on ABC Family in the summer.
ABC Family's Michael Riley said: "We're very proud of our deep bench of original content successfully built out over eight years of exceptional growth.
"This summer, we're excited to continue to expand our content across key genres adding another season to our groundbreaking drama, Secret Life, wonderful comedy, and a return to reality programming as we continue to innovate with our ABC Family brand."
Secret Life will return for its fourth season on ABC Family on March 26.
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