The invention discloses a mechanical keyboard button structure including a base plate, a circuit board, a mechanical switch and a keycap, wherein the base plate, the circuit board, the mechanical switch and the keycap are connected in order from bottom to top; the mechanism switch is used for guiding the keycap to move up and down and converting a pressure of the keycap into a switch signal to transmit to the circuit board to communicate a circuit; the mechanical switch includes a supporting plate and a switch spindle arranged on the supporting plate and further includes a pair of scissors, the upper portion of the pair of scissors is fixed with the bottom surface of the keycap, while the lower portion is fixed with the supporting plate, and the switch spindle passes through the pair of scissors and supports against the bottom surface of the keycap. According to the invention, the mechanical axle structure is combined with the scissor structure, so that the button is supported more stably, the service life is long, and the corner has both better hand feeling and function; second, the structure can be used for the keyboard with a shorter stroke, so that the keyboard is thinner and lighter and is more widely applied in the market; at last the whole circuit does not need to be replaced when the trigger circuit below a single key is damaged, and the single button can be repaired and replaced.