The invention discloses an aluminate red phosphor, a preparation method and application. Activation ions of the aluminate red phosphor are trivalent europium ions Eu<3+>; the chemical formula of the aluminate red phosphor is M<II>3RE<III>1-xEuxAl2O7.5, wherein, M<II> is one or more selected from the group consisting of Mg<2+>, Ca<2+>, Sr<2+> and Ba<2+>, RE<III> is at least one selected from the group consisting of La<3+>, Ce<3+>, Pr<3+>, Nd<3+>, Sm<3+>, Gd<3+>, Tb<3+>, Dy<3+>, Ho<3+>, Er<3+>, Tm<3+>, Yb<3+>, Lu<3+>, Sc<3+> and Y<3+>, and x is mole percentage of doped Eu<3+> and is no less than 0.0001 and no more than 1.0. The aluminate red phosphor has strong excitation at a wavelength of about 400 nm, high luminous efficiency and good thermal stability and emits red fluorescence which mainly has a wavelength of 613 nm under the excitation of near ultraviolet light. The preparation method provided in the invention is simple, has good reproducibility, enables a product to have stable quality and is easy to operate and easily applicable in industrial production.