The invention provides a key locking keyboard, and belongs to the technical field of computer accessories. A key locking circuit is arranged on a data transmission line between a keyboard key circuit and a USB interface. The key locking circuit comprises a main control chip, a one-key locking switch, a pull-up resistor, a resistor, a triode, a relay, a connecting switch, a power-on reset circuit, a power circuit and a crystal oscillation circuit. A keyboard body is the same as a common computer keyboard, the key locking keyboard is characterized in that one more key is arranged at the upper right corner of the keyboard, the key can lock all the other keys of the keyboard, and the other keys are disabled. When a user needs the keyboard to operate the computer, the key can be pressed down, all the other keys of the keyboard are unlocked, the user can normally use the keyboard, the user with a small computer table can conveniently work, the keys of the keyboard are prevented from being pressed by mistake, and the key locking keyboard is convenient to use and simple in structure.