The utility model relates to a telescopic crutch with a purely mechanical button switch for adjusting the height in a timely manner. The crutch can be an armpit crutch or a hand-held crutch. Press the button with your finger and press the handle synchronously, the crutch becomes shorter, the height is lowered, the button is released, and the height is maintained; Press the button with your finger, the handle does not exert an external force of downward pressure, the crutch becomes longer, and the height increases, When the button is released, the height remains unchanged; in the button release state, the handle is pressed down, and the height of the crutch is locked, so the height remains unchanged. A safe, reliable, easy-to-operate, convenient, timely, and fast cane for adjusting the height of the crutches to the height required by the walkers using the crutches is obtained, which is suitable for the disabled of the lower limbs and those with inconvenience or difficulty in moving. It provides great convenience for walkers when they go up the stairs from the level road or when they want to sit lower than standing, allowing them to walk with more dignity.