The invention discloses a novel combination flooding oil flooding experiment/test simulating method. The method comprises the steps that 1, a set of three-dimensional core models is manufactured in combination with the oil reservoir condition, a set of complete water flooding process oil flooding test and combination flooding process oil flooding test is completed on each model in sequence, and it is equivalent that minitype field tests are completed under the oil reservoir condition; 2, equivalent fitting of the oil flooding tests and the minitype field tests under the field oil reservoir condition is achieved through a numerical simulation study means, and a digital reservoir geology model platform including water flooding information and combination flooding information is built; and 3, content study is carried out on the field tests on the digital reservoir geology model platform through digital oil flooding test study. According to the method, the workload of the combination flooding indoor oil flooding test can be greatly reduced, optimized oil flooding scheme design of an oil reservoir which has combination flooding potential and is not subjected to an oil flooding test can be completed on the platform, and the quality of the field oil flooding test is improved.