The invention discloses a special fertilizer used for assisting yield increase of paddy rice. The special fertilizer comprises the following raw materials: a rapeseed cake, fermented pig manure, urea, ammonium sulfate, calcium nitrate, diammonium phosphate, potassium chloride, magnesium sulfate, zinc sulfate, sodium selenate, ammonium molybdate, copper sulphate and a soil conditioner. The soil conditioner comprises the following components: bentonite, perlite, citric acid, oxalic acid, nitrohumic acid, a phosphate-dissolving bacterium, dicyandiamide, N-butylthiophosphoryl triamide, polyethylene glycol and acrylamide. The special fertilizer used for assisting yield increase of paddy rice in the invention has a scientific formula and reasonable nutrients; and when applied in plantation of paddy rice, the special fertilizer can improve the utilization rate of fertilizers, resist lodging and insect attack, increase the output of paddy rice, improve the quality of paddy rice, enhance physical and chemical properties of soil and prevent soil hardening.