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The magneto-optical spectra of ABC-stacked trilayer graphene are enriched by the electric field. A lot of prominent absorption peaks, which arise from the inter-Lnadau-level transitions, gradually change from the twin-peak structures into the double-peak ones with the increasing electric-field strength. This comes from the destruction in mirror symmetry of xy-plane and the non-equivalence for two sublattices with the identical projections. Specially, a single threshold peak becomes a doublepeak structure, owing to the Fermi-Dirac distribution. The absorption frequencies continuously grow or decline except for the anti-crossings of Landau levels. Also, such anti-crossings can induce extra double-peak structures.

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