Baby stroller capable of implementing free switching between single seat and double seats

A baby stroller capable of implementing free switching between a single seat and double seats, comprising a stroller body (1), a retractable chassis (2) being provided at the bottom of the stroller body (1), characterized in that a retractable upper enclosure (3) is mounted at a middle portion of the stroller body (1), the retractable upper enclosure (3) comprises a fixed rod (4) and a telescopic rod (5), the fixed rod (4) and the telescopic rod (5) each are hollow in a U shape, universal wheels (6) are mounted at the bottom of the retractable chassis (2), the telescopic rod (5) is slidably connected in the fixed rod (4), an end of the fixed rod (4) is provided with a female locking buckle (7) for positioning the telescopic rod (5), a sub-locking buckle (8) is arranged in the telescopic rod (5), and a check block (9) is fixed to an end of the telescopic rod (5);

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• the female locking buckle (7) comprises a housing (701), the housing (701) is fixed to an end of the fixed rod (4) by means of a screw, the sub-locking buckle (8) comprises a lock block (801), the lock block (801) is mounted in an inner cavity of the telescopic rod (5), two lock blocks (801) are provided, each of the lock blocks (801) is internally provided with a positioning block (802), an inner cavity of the housing (701) is provided with a limiting mechanism for slidably limiting the lock block (801), and the bottom of the housing (701) is provided with a trigger mechanism (10) of the positioning block (802).