Flatness measuring device

The utility model discloses a flatness measuring device which comprises a base, a moving mechanism and a detecting mechanism are arranged on the base, the moving mechanism can control a control shaft to move in two directions through a moving motor and a power motor which are arranged as power elements, and a photoresistor is arranged in the detecting mechanism and can sensitively sense light. The influence of the sensed light intensity on the resistor is converted into the current intensity, the quantitative result is displayed through the display screen arranged on the fixed shell, and the resistance can be changed through the light change and displayed on the display screen through the photoresistor, so that the flatness gaps are quantified, detection is convenient, and the detection efficiency is improved. The telescopic shell can block ambient light to the maximum extent, so that the device can be used under the condition of bright light, the environment adapts to more environments, the telescopic shell