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1. A preparation method for ultra-high compacted lithium iron phosphate cathode material, comprising: S1. conducting a chemical reaction based on iron phosphate and dispersant to obtain an iron-containing precursor; S2. obtaining an iron-containing precursor mixture by mixing the iron-containing precursor, a borane, a lithium source, a phosphorus source, and a first carbon source; using ultraviolet light to irradiate the iron-containing precursor mixture; performing a first sintering to the irradiated iron-containing precursor mixture and crushing to obtain a first precursor mixture, grinding the first precursor mixture to a first preset particle size to obtain a first precursor, wherein the borane is a borane nanosheet or a borane nanomembrane; S3. mixing and grinding the iron-containing precursor, the lithium source, the phosphorus source, and a second carbon source, performing a second sintering to obtain a second precursor mixture, and grinding the second precursor mixture to a second preset particle size to obtain a second precursor, where the second carbon source is an amino acid chelated titanium; S4. mixing the first precursor, the second precursor, and a third carbon source, then drying and performing a third sintering in an inert gas atmosphere to obtain the lithium iron phosphate cathode material.
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