The present invention discloses a transformer substation bus power frequency voltage measurement device. A transformer substation bus is a high-voltage conductor with a tube-shaped structure, the measurement device comprises sheet metal, a resistor and a photoelectric measurement module; the sheet metal is in insulation connection with the high-voltage conductor; the sheet metal is electrically connected with one end of the resistor, and the other end of the resistor is electrically connected with a bus to be measured; and the photoelectric measurement module is connected with two ends of theresistor in parallel, and the photoelectric measurement module is configured to measure voltages of two ends of the resistor and calculate the voltage of the high-voltage conductor according to the voltages of the two ends of the resistor. The transformer substation bus power frequency voltage measurement device does not need a transformer so as to solve the technical problems that the mode of using the bus voltage of the mutual inductor measurement transformer is insufficient in precision and safety and improve the precision and the safety of the voltage monitoring of the transformer bus.