Proppant function detection device and method

The invention provides a proppant function detection device and method, and the device comprises a stratum simulation structure which comprises a structure main body with an accommodation cavity, a lower layer structure and an upper layer structure which are disposed in the accommodation cavity, and a gap formed between the lower layer structure and the upper layer structure, the first opening and the second opening are formed in the two ends of the structure body and communicate with the gap correspondingly, and the filter screen is arranged on the second opening. The first pumping system is used for pumping sand-carrying fluid between the upper-layer structure and the lower-layer structure; the first backflow system is used for outputting liquid in the sand-carrying fluid in the process of pumping the sand-carrying fluid; the second pumping system is used for pumping water into the proppant filling layer; the second backflow system is connected to the first opening and used for outputting backflow liquid in