Seat angle multi-section adjusting mechanism and swing dining chair

The utility model discloses a multi-section angle adjusting mechanism for a seat. The seat comprises a seat pocket and a backrest, sliding grooves are formed in the edges of the two sides of the back face of the backrest respectively, the sliding grooves extend backwards, obliquely and downwards, a spring bolt and a compressed spring are placed in each sliding groove, and a protrusion extending outwards is arranged on each spring bolt. An adjusting pull rod is installed in the middle of the front face of the backrest and can slide up and down along the backrest, the lower end of the adjusting pull rod is connected with a steel cable, and the two ends of the steel cable are connected with the lower ends of the compression springs on the two sides respectively. Symmetrical grooves are formed in the inner wall faces of armrests on the two sides of the seat pocket respectively, a plurality of clamping grooves are formed in each groove, and protrusions on the spring bolt are meshed with the clamping grooves, so th