The invention provides a reservoir layer automatic tracing method based on seismic waveform features, and belongs to the field of geophysical exploration seismic interpretation and comprehensive research. According to the method, firstly, seismic data is normalized into a certain interval, multiple areas with different numerical ranges are separated out in the interval, each area represents a character, and by converting the seismic data into character strings and converting the seismic waveform in a character string form, different seismic waveform features can be more accurately highlighted;then, through well-seismic calibration, the location of a target reservoir layer and the combination mode of the character strings of the location of the target reservoir layer are determined, the combination mode of the character strings serves as an identification template, and by means of seed points and a certain time window range, fully three-dimensional automatic tracing is conducted. By using the method, the seismic waveform features can be precisely textualized, and reservoir layers are fast traced by adopting a text matching method.