The utility model relates to a connecting device for penetrating through a leachate guiding and discharging pipeline and an impervious membrane of a refuse dam of a municipal solid waste landfill, comprising a refuse dam, an impervious HDPE membrane and an HDPE leachate guiding and discharging pipeline. The connecting device for penetrating through the leachate guiding and discharging pipeline and the impervious membrane of the refuse dam further comprises a pipe-wrapping HDPE membrane and a connecting HDPE membrane; the leachate guiding and discharging pipeline positioned outside a refuse dam body is wrapped by the pipe-wrapping membrane, and the width of the pipe-wrapping membrane is the same as the outer diameter of the leachate guiding and discharging pipeline; the longitudinal abutment joint of the pipe-wrapping membrane is closed and fixedly connected, and the pipe-wrapping membrane is closely fixed at the leachate guiding and discharging pipeline; the connecting membrane is laid on the outer surface of the impervious membrane and surrounds the leachate guiding and discharging pipeline; the outer periphery of the connecting membrane is closely fixed on the impervious membrane; the connection position of the connecting membrane and the pipe-wrapping membrane is closely and fixedly connected; and the other end of the leachate guiding and discharging pipeline wrapped by the pipe-wrapping membrane is provided with a clamping plate which enables the pipe-wrapping membrane and the leachate guiding and discharging pipeline to be closely attached. The connecting device for penetrating through the leachate guiding and discharging pipeline and the impervious membrane of the refuse dam of the municipal solid waste landfill has simple structure, convenient construction and reliable quality, and can guarantee no leakage of the leachate of the municipal solid waste landfill.