Baby stroller capable of being automatically folded by one hand

The invention discloses a single-hand automatic folding baby stroller which comprises a rear supporting rod assembly, a push rod assembly, a front supporting rod assembly, a rear connecting rod assembly, a seat plate assembly, a backrest assembly and a guardrail assembly. The push rod assembly is composed of an upper push rod assembly and a lower push rod assembly, and a locking piece is arranged in the middle of the upper push rod assembly; the upper push rod assembly and the lower push rod assembly are rotationally connected through a first rotating point. The lower end of the push rod assembly is rotationally connected with the upper end of the rear supporting rod assembly and the upper end of the front supporting rod assembly through second rotating points. One end of the rear connecting rod assembly is rotatably connected with the rear supporting rod assembly, and the other end is slidably connected with the lower push rod assembly; the rear end of the seat plate assembly is rotationally connected with t