The invention provides a dust remover by-pass valve and relates to a dust remover. The dust remover by-pass valve is provided with a power device, a lifting rod, a valve plate and a valve seat. The upper portion of the lifting rod is connected with the power device. The bottom end of the lifting rod is fixedly connected to the top of the valve plate, the valve plate and the valve seat are of annular conical surface structures, and the outer side annular conical surface of the valve plate is in sealing matched connection with the inner side annular conical surface of the valve seat. The valve seat is arranged on the inner side of the inlet position of a dust remover air duct and provided with an elastic sealing material layer. Sealing is achieved through the annular conical surfaces of the valve seat and the valve plate, a sealing coil structure mode of an existing by-pass valve is completely changed, shortcomings of an original sealing mode are overcome, and by-pass zero leakage is ensured. In addition, the manufacture and installation accuracy requirements are low, and the problem that dust easily accumulates on a line-sealed by-pass valve can be solved. Due to the fact that the dust remover by-pass valve is sealed by adopting the annular conical surfaces, the leakage problem caused by thermal expansion and cold contraction in the running process in a line-sealing mode is solved, long-period reliable usage can be ensured, additional sealing gas is not needed, and the dust remover by-pass valve has the advantage of saving energy.