An embodiment of the invention provides a Huffman compression method and device. The method comprises steps as follows: to-be-compressed texts are acquired and traversed, and character space of the to-be-compressed texts is determined; the corresponding transferring probability when a character behind each current character in the character space corresponds to at least one first character is determined according to multiple characters in the character space; the transferring probability threshold value is obtained according to the transferring probability and the number of the multiple characters in the character space; when each transferring probability of all the transferring probabilities meets the preset condition, at least one first character corresponding to the transferring probability meeting the preset condition and the current character are combined to form an encoding unit, and the current character corresponding the transferring probability failing to meet the preset condition is taken as an independent encoding unit; a Huffman tree is established according to the independent encoding units and the encoding units obtained through combining, and each encoding unit is encoded. Accordingly, the data compression effect is improved and the data compression rate is increased during Huffman encoding.