The invention discloses a preparation method for spun-bonded filament orange petal-type superfine leather. The preparation method comprises the following steps: first, preparing two-component orange petal-type composite filament fibres by adopting a spun-bonding method, paving a net on a net curtain, and strengthening through spunlace to obtain a base fabric of a non-woven fabric; then, preparing a water-based polyurethane surface layer and a foaming layer on release paper, and preparing a water-based polyurethane bonding layer on the base fabric; finally, adhering the surface layer and the foaming layer to the bonding layer of the base fabric to obtain the spun-bonded filament orange petal-type superfine leather. Compared with the prior art, the filament spunlace non-woven fabric is spun-bonded by adopting two-component superfine fibres, and water-based polyurethane resin is combined, so that the problems of organic wastewater caused by a methylbenzene reduction or alkaline reduction process and DMF (Dimethyl Formamide) solvent pollution caused by a solvent type production system in the existing superfine fibre synthesis leather industry are effectively solved; a superfine fibre synthesis leather production line which is simple in process, green, environment-friendly and pollution-free is formed.