By means of time-evolution operator, we have studied the emission spectrum of a Λ-type three-level atom interacting resonantly with two-mode entangled coherent-states cavity fields. The physical spectrum expression of radiation emitted by the atom is given. We have discussed the structure of the emission spectrum for an entangled coherent-states input. The results indicate that whether two lower levels are degeneracy or not, the emission spectra of Λ-type three-level atom show Rabi splitting when the average photon number of two-mode entangled coherent states cavity fields is very small. And intensity increases with entanglement of two-mode entangled coherent-states cavity fields. When two lower levels are degeneracy, the structure of the resonant spectra of the atomic system has many symmetric peaks if the average photon number of two-mode entangled coherent-states cavity fields is very small, and the structure of the resonant spectra of the atomic system has five symmetric peaks if the average photon number of two-mode entangled coherent-states cavity fields is very large. When two lower levels are not degeneracy, the structure of the resonant spectra of the atomic system has many symmetric peaks if the average photon number of two-mode entangled coherent-states cavity fields is very small, and the structure of the resonant spectra of the atomic system has ten symmetric peaks if the average photon number of two-mode entangled coherent-states cavity fields is very large. Two substantial differences exist between emission spectra of the atom system with two-mode entangled coherent states cavity fields and that with non-entangled coherent field. One is that, the stronger the entanglement of two-mode entangled coherent-states cavity fields is, the higher the intensity of Rabi peaks are, the other is that entangled coherent character induces the structure of symmetric multi-peak of the resonant spectra of the atomic system.