The invention relates to a test well backflow gas and liquid filtering and silencing integrated device. Test well backflow liquid enters a self-cleaning filter; the self-cleaning filter is provided with a clean liquid outlet and a sewage outlet; the clean liquid outlet of the self-cleaning filter is communicated with a water outlet through a clear water pipeline; the sewage outlet of the self-cleaning filter is communicated with a water tank through a sewage pump; the water tank is provided with a water tank outlet; the water tank outlet is communicated with a drain outlet through a conveying pipeline; a conveying water pump is arranged on the conveying pipeline; test well backflow gas is connected with an emptying silencer through a gas inlet and a gas inlet pipeline; the emptying silencer is arranged inside the water tank. The test well backflow gas and liquid filtering and silencing integrated device integrates filtering and silencing functions, combines two working processes of filtering and recycling the liquid and emptying and silencing the gas, helps to solve the noise problem caused by floating of a suspended matter and emptying in a test, and can effectively reduce a series of problems such as noise pollution and water pollution.