The utility model discloses a baby stroller which comprises a frame with an unfolding state and a folding state, and a locking mechanism used for locking the frame in the unfolding state. The frame comprises front foot pipes, rear foot pipes, seat connecting seats and stroller folding sliding seats capable of sliding towards the lower portions of the front foot pipes, wherein the seat connecting seats are rotationally connected with rear supports, the rear supports are rotationally connected with the rear foot pipes, one end of each rear foot pipe is fixedly connected with the corresponding seat connecting seat, the seat connecting seats are rotationally connected with the stroller folding sliding seats, reversing rotating seats capable of being reversed in a front-and-back mode and push handle assemblies are arranged on the seat connecting seats, the seat connecting seats are connected with the reversing rotating seats in a locking mode, and seat assemblies are arranged on the seat connecting seats. The baby stroller is simple in structure, convenient to fold and operate, small in folded size and high in safety in the push handle reversing process.