Annular landscape fishpond purifying and filtering system and setting method

The invention discloses an annular landscape fishpond purifying and filtering system and a setting method, the annular landscape fishpond purifying and filtering system comprises an annular fishpond, a central island, a pedestrian garden path laid along the annular inner ring of the fishpond, a plurality of trestles and the like, a purifying device is mainly arranged on the central island, and a water inlet and outlet pipe of the purifying device is connected into the fishpond to purify water; a settling pond, a main water pump set A and n auxiliary water pump sets are arranged in the fish pond, the settling pond is defined by an overflow dam and pond walls on three sides, a plurality of water drainage holes distributed in a plum blossom shape are formed in the pond wall right opposite to the overflow dam, and a plurality of longitudinal supporting rods and transverse supporting rods which intersect longitudinally and transversely to form a plurality of #-shaped longitudinal supporting rods are arranged in th