The invention relates to a solvent-free epoxy self-leveling roller coating floor paint and a preparation and use method thereof. The paint comprises a low-viscosity epoxy resin compound, an active diluent, an inactive diluent, a defoamer, a leveling agent, a wetting dispersant, a thixotropic additive, a solvent-free phthalocyanine blue pulp, a solvent-free lemon yellow pulp, a solvent-free titanium white pulp, a solvent-free carbon black pulp, quartz powder, precipitated barium sulfate and a modified alicyclic amine curing agent. The preparation and use method comprises the following steps: preparation of various solvent-free individual color pulps, preparation of a component A and use manner; the low-viscosity epoxy resin compound is a compound of bisphenol-A epoxy resin and bisphenol-F epoxy resin, the viscosity of the compounding system is greatly reduced under the condition of no solvents, the viscosity of the solvent-free system is improved, the amount of the active diluents and the inactive diluents is reduced, the physical mechanical performances of coatings are guaranteed and the paint is endowed with excellent levelability, so that the paint disclosed by the invention has roller coating self levelability and excellent construction performance.