The invention relates to the technical field of self-service payment terminals and provides a multi-language integrated calling engine in a power self-service payment terminal and an application method of the calling engine. The multi-language integrated calling engine comprises a language identification module, an instruction identification module, a service language logic module, a voice service logic module, a text message service logic module, a service application logic module and a business support database. The multi-language integrated calling engine is reasonable and compact in structure and convenient to use; the calling engine is capable of identifying the power purchase card of a user, calling the user information and judging the nationality of the user, and then providing the services of a corresponding language; the user is instructed to understand information displayed on a terminal and perform function operations in a double promoting manner of voice and text, and therefore, even a user who cannot identify the text information can operate the terminal; the calling engine is provided with an integrated voice corpus and a text information library, operation instructions are marked, and the services of new languages of the terminal can be realized by adding the voice corpus and the text information library of the new languages.