The invention discloses a height measuring apparatus based on a stepping motor. The height measuring apparatus based on a stepping motor includes a housing with a hollow central section, wherein a stepping motor, a singlechip, a stepping motor power control module, a display, a keyboard, and a photoelectric proximity switch are mainly arranged in the housing; the stepping motor power control module, the display, the keyboard, and the photoelectric proximity switch are connected with the singlechip; the stepping motor is connected with the singlechip through the stepping motor power control module; a photoelectronic counting apparatus is arranged at the front end of a stepping motor shaft; a pressure sensor transmission device is arranged at the back end of the stepping motor shaft; the photoelectric proximity switch is arranged at one side of the photoelectronic counting apparatus; and a pressure sensor is arranged at the bottom end of the transmission device, and is located at the outer edge of the housing. The height measuring apparatus based on a stepping motor has the advantages of being simple in structure, being low in cost, realizing height measurement by measuring the rotation number of turns of the stepping motor, being high in the measuring accuracy, and being easy to adjust the measuring accuracy. Besides, as the photoelectric proximity switch is arranged in the housing, the measuring result is not influenced by the external environment and the measuring system is high in stability and is easy for maintenance.