The invention provides a signal change graph drawing method, belongs to the technical field of a computer and is used for solving the problem that violently changed signals cannot be displayed visually through utilization of the signal change graph drawing method in the prior art. The method comprises the steps of obtaining to-be-drawn signals arranged according to a collection time sequence, wherein the to-be-drawn signals comprise amplitudes; judging whether the amplitudes of the to-be-drawn signals satisfy a preset amplitude change condition or not; and if the amplitudes of the to-be-drawn signals satisfy the preset amplitude change condition, drawing a signal change graph of the to-be-drawn signals in a first coordinate mode, otherwise, drawing the signal change graph of the to-be-drawn signals in a second coordinate mode. According to the method provided by the invention, for the signals collected in a time period during which the signals are changed violently and the signals collected in the time period during which the signals are changed stably, the signal change graph is drawn in different coordinate modes, the signals with relatively high amplitudes and the signals with relatively low amplitudes can be displayed at the same time, and the total signal change trend is grasped visually.