The invention discloses a method for measuring a power frequency and impulse superposed voltage waveform. The method includes: converting a high-voltage power frequency voltage and impulse voltage superposed waveform into a low-voltage signal by using a broadband voltage divider, and separately outputting the low-voltage signal to a high sampling rate collection unit and a low sampling rate collection unit; calculating, by using an impulse voltage calculation module, the low voltage signal received by the high sampling rate collection unit, to obtain a peak voltage and a time parameter of an impulse voltage; calculating, by using a power frequency voltage calculation module, the low voltage signal received by the low sampling rate collection unit, to obtain a peak voltage and a frequency parameter of a power frequency voltage; and superposing, in a timeline by triggering a phase calculation module, the low voltage signal received by the high sampling rate collection unit onto the low voltage signal received by the low sampling rate collection unit, and calculating a trigger phase through a location at which a trigger moment is located in a cycle of the high-voltage power frequencyvoltage.