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We investigate theoretically the influence of the Rashba spin-orbit interaction at the helical multiferroic/ferromagnetic-oxide interface on the tunnel magnetotransport across multiferroic heterojunctions (e.g., Pt/FbMnO3/SrRuO3).In addition to a residual topological effective spin-orbit coupling induced by the spiral spin ordering in the helimagnetic barrier ,the spin-dependent interaction results in an oscillatory tunneling anisotropic magnetoresistance (TAMR) with C2v symmetry.A large modulation of TAMR is realized by an external electric field due to the gate-controllable Rashba spin-orbit interaction and the magnetoelectric coupling, an effect of a potential for applications.