The application relates to an octopus step voltage detection device. The device comprises a light indicator (1), voltage lines (2) and multiple pairs of metal contact pins (3) with spacing of 0.5-1.2m; the metal contact pins (3) are distributed in an umbrella shape; different pairs of metal contact pins (3) are connected to the light indicator (1) in parallel through voltage lines (2); when the metal contact pins (3) contact a to-be-detected surface with the potential difference, the light indicator (1) is driven by a pair of metal contact pins (3) producing the maximum voltage and emit the corresponding indicator light. The grounding device nearby ground surface step voltage of all electric equipment and peripheral industrial equipment can be monitored in real time, and the detection device has an alarm indication function, the light indication color or light intensity can be changed according to the size of the step voltage to perform the alarm; a worker can monitor the equipment grounding device nearby ground surface step voltage at the first time before work, and the safety coefficient of the pedestrian and personnel in the construction process can be greatly improved.