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This invention provides a high-calorific-value biomass fuel made from agricultural waste and its preparation method, belonging to the field of biomass energy utilization technology. The biomass fuel comprises agricultural waste and cellulase or lignin; the amount of cellulase or lignin added is 0.5%-1.0% of the agricultural waste. The preparation method is as follows: the agricultural waste is dried and coarsely crushed, then sieved, magnetically separated, and air-separated before fine crushing to obtain powdered raw material; cellulase or lignin is added to the powdered raw material, mixed evenly, and then extruded to obtain the high-calorific-value biomass fuel. The preparation method of this invention employs a combination of two-stage crushing, multi-stage sieving, intelligent magnetic separation, and air separation, as well as multi-stage drying, intelligent moisture control, and dry-wet material ratio. The prepared biomass fuel has a stable calorific value and high energy density, significantly reduced pollutant emissions, strong agricultural waste digestibility, low raw material cost, and stable supply, thus promoting energy structure transformation.