The invention provides a wax inhibitor added during fracturing construction. The wax inhibitor is prepared from the following raw materials in percentage by weight: 10%-20% of sodium stearate, 10%-20%of peregal O-25, 10%-15% of fatty alcohol polyoxyethylene lauryl ether sulfate sodium AES, 5%-10% of sodium dodecyl benzene sulfonate ABS, 0.5%-1% of ethylenediamine traacetic acid, 1%-2% of rosin powder, and the balance of quartz sand. Meanwhile, the invention also provides a preparation method and application of the wax inhibitor. The wax inhibitor provided by the invention does not need separate construction, is added during fracturing construction and can penetrate through the distal end of stratum, so that the action range of the wax inhibitor in the stratum is enlarged, the effective time is long, and the wax inhibitor can be slowly released in the stratum at 30 DEG C for about 2 years; wax inhibition is carried out before crude oil production, so that the source of wax production is directly cut off, and the generation of wax is fundamentally prevented; construction is convenient and construction cost is reduced.