The invention relates to a preparation method for controlled-release 
fertilizer special for mechanically applied rice. The preparation method comprises the following steps: performing double-layer 
coating by using high 
tower pelleting compound 
fertilizer as core 
fertilizer to obtain the corresponding double-layer 
coating controlled-release fertilizer I, double-layer 
coating controlled-release fertilizer II and double-layer coating controlled-release fertilizer III, wherein the bottom layer 
urea coating accounts for 4 to 6 weight percent of the core fertilizer, and the outer layer 
film coating agent accounts for 2 weight percent, 4 weight percent and 6 weight percent of the 
urea coated fertilizer respectively based on the total weight of the reclaimed 
polyethylene film resin and the reclaimed 
polystyrene foam resin; and mixing the double-layer coating controlled-release fertilizer I, the double-layer coating controlled-release fertilizer II and the double-layer coating controlled-release fertilizer III according to the 
mass ratio of 1:(1-3):(1-2) to obtain the controlled-release fertilizer special for mechanically applied rice. The controlled-release fertilizer special for mechanically applied rice meets the absorption requirements of the rice on 
nitrogen, 
phosphorus and 
potassium nutrients in the growth stage, is difficult to crush and is suitable for mechanical fertilizer application.