The invention provides an intelligent input method and device for electronic medical records. The intelligent input method comprises the following steps: classifying massive electronic medical record text data according to disease categories; performing similarity calculation on the sentences under each disease category, and clustering the sentences according to the similarity; extracting keywords or words within the first few words of the same kind of sentences as sentence heads, establishing a sentence head library, taking other parts of the same kind of sentences except the sentence heads as sentence tails, establishing a sentence tail library, counting the occurrence frequency of the same kind of sentence tails, and establishing a sentence frequency library; after a specific keyword or word is input and a sentence head library is matched ,determining a sentence clustering category, calling a sentence tail library and a sentence frequency library, carrying out sentence tail completion, and displaying a plurality of sentence tails with frequency ranks from high to low in the sentence frequency library on display equipment for a user to select; and obtaining the sentence tail selected by the user every time and updating the sentence frequency library in real time. The medical record input efficiency of medical staff can be effectively improved, so that more time is reserved for treating a patient, and the medical quality is improved.