The invention relates to a test method of a PVC (polyvinyl chloride) paste resin paste material volume change rate. The method comprises the following steps of measuring and weighing a sample; performing vacuum degassing treatment on the sample; recording sample foam breaking time; recording the sample foam breaking volume; calculating the sample volume change rate, wherein in the step, the sample can be put into the same container with the volume measuring function for treatment and/or operation. The test method of the PVC paste resin paste material volume change rate provided by the invention has the advantages that during the vacuum degassing treatment on the PVC paste resin paste material sample, the volume change of the sample is directly observed; the foam breaking volume and the sample foam breaking time can be conveniently recorded; further, the volume change rate calculation is convenient. The method has the advantages that the operation is simple; the test result is precise.