Angle-adjustable rotary excavating tooth for pile foundation engineering

The utility model belongs to the technical field of building machinery, and particularly discloses an angle-adjustable pile foundation engineering rotary excavating tooth which comprises a drill bit internally provided with a cavity, an adjusting assembly is arranged in the cavity, a rotating sleeve of the adjusting assembly is fixed to the upper portion of the inner wall of the drill bit, and a rotating rod penetrates through a threaded hole or a through hole I of the rotating sleeve and extends to the outer side of the top end of the drill bit. A plurality of connectors are arranged on the outer wall of the adjusting clamping ring in a surrounding mode, connecting rods are hinged to the connectors, linkage rods are rotationally connected to the other ends of the connecting rods, a plurality of through holes II with rotating columns inside are formed in the lower portion of the side wall of the drill bit in a surrounding mode, the inner sides of the rotating columns are fixed to the linkage rods, and fixing