Three-point contact type multifunctional measuring instrument and measuring method thereof

The invention discloses a three-point contact type multifunctional measuring instrument and a measuring method thereof, and belongs to the technical field of measuring equipment. A display screen and control keys are arranged on a main body; the same-amplitude different-direction length measuring mechanism is rotationally connected to the main body and is used for measuring the distance between two opposite end points of the to-be-measured object; the depth measuring mechanism is in sliding connection with the main body and is used for measuring the concave depth of the to-be-measured object; the height measuring mechanism is in sliding connection with the depth measuring mechanism and is used for measuring the protruding height of the object to be measured. The control mechanism is installed in the main body, is a PLC control system, and is electrically connected with the display screen, the control keys, the same-amplitude different-direction length measuring mechanism, the height measuring mechanism and th