The invention discloses an oxygen supply type growth promoting flower organic composite fertilizer, which is prepared from raw materials including dry pond silt, modified oxygenates, modified slow release agents, modified filling materials, urea, monoammonium phosphate, potassium chloride, ammonium chloride, diammonium phosphate, calcium biphosphate, zinc sulfate, ammonium molybdate, magnesium sulfate, oyster shell powder, kaolin powder, talcum powder, dolostone powder, zeolite powder, thiourea, dicyandiamide, chicken manure, cicada manure, worm excretion, maize straws, rapeseed cake, bagasse, fly ash, perilla seeds, humic acid and EM strains. The organic composite fertilizer provided by the invention has the advantages that rich nutrition substances can be provided for the growth of flowers; in addition, sufficient oxygen can be provided for the basic growth of the flowers; the growth of the flowers is effectively promoted; the survival rate of the flowers is improved.