The invention discloses a method for preparing diphenol type phosphor-containing high flameproofing benzene-oxaxine resin, which uses monoamine, phosphor-containing diphenol formaldehyde as raw reaction materials. A benzene-oxaxine midbody is introduced with a compound containing phosphor to synthesize a phosphor-containing flameproofing benzene-oxaxine midbody which is solidified and crosslinkedto obtain thermalsetting phosphor-containing high flameproofing benzene-oxaxine resin. Other fire retardants are not required to be added into the flameproofing materials which adopt the phosphor-containing flameproofing benzene-oxaxine resin of the invention as the basic flameproofing material; the flameproofing material using the resin has excellent flameproofing capacity, the flameproofing levelcan reach V-0, the thermal capacity is rather good and the vitrification transforming temperature can reach 225 DEG C. The phosphor-containing flameproofing benzene-oxaxine midbody which is preparedb y the method of the invention can be individually used or used by being mixed with other type benzene-oxaxine midbody or phenolic resin or epoxy resin; an obtained solidified product has higher thermal resistance, and the phosphor-containing flameproofing benzene-oxaxine midbody is applicable to the production of structural material, flameproofing material, electric insulation material, electronicencapsulation material, ablation resistance material or braking material with high capacities which are used at the temperature higher than 180 DEG C.