Novel probe height automatic testing machine

The utility model discloses a novel probe height automatic testing machine. The device comprises a PLC control system, an air source regulating valve, an outer box, a positioning mechanism and a detection mechanism, the PLC control system is arranged in the outer box; the air source regulating valve is in air supply connection with a pressing cylinder of the positioning mechanism; a to-be-tested product is placed in the positioning mechanism. The start button is in control connection with the pressing air cylinder through the power switch. An indicating lamp is arranged on one side of the start button; a detection mechanism is arranged on the front side of the positioning mechanism; the PLC control system is in control connection with the stepping motor; a steering driving shaft of the stepping motor is sleeved with a rotating shaft sleeve, a knob and a coupler are sequentially arranged below the rotating shaft sleeve, origin optical fibers and limiting optical fibers are arranged at different positions of th