The invention discloses a one-hand input keyboard, which comprises multiple keys. Among the keys with characters, each key corresponds to a first-level input combination consisting of two characters or one character; the keys of each line are sorted from left to right when the right hand is used or from right to left when the left hand is used as follows: the five keys on the first line correspond to the character combinations 'YT', 'UR', 'IE', 'OW' and 'PQ' respectively; the four keys on the second line correspond to the character combinations 'HG', 'JF', 'KD' and 'LS' respectively; the characters 'A', 'N', 'B', 'M', 'V', 'C', 'X' and 'Z' are arranged on other keys in a manner that one key corresponds to one or two characters; for each key corresponding to two characters, when the key ispressed once, one character of the combination on corresponding key is input; and when the key is pressed twice continuously and quickly, the other character of the combination is input. The keyboardhas a small volume and is convenient to use and carry and favorable for rapid touch typing operation.