The invention relates to the field of plugging materials for drilling fluids, in particular to modified polypropylene fibers and a preparation method thereof, a fiber reinforced plugging material fordrilling fluids, and a drilling fluid and application thereof. The fiber reinforced plugging material for drilling fluids according to the invention comprises, by weight, 10-30% of modified polypropylene fibers, 10-20% of a plant plugging agent, 30-40% of fine calcium carbonate, 10-20% of asphalt, and 10-20% of rubber. The fiber reinforced plugging material for drilling fluids has the advantages that a plugging layer formed is compact, shear strength is good, bearing capacity is high, the material can be used with different base slurries, and the material is widely applicable.