The invention discloses a pressure regulating and power generating device for a small-sized natural gas pipe network. The pressure regulating and power generating device comprises a box body and further comprises a pressure regulating unit and a power generating unit which are arranged in the box body; the pressure regulating unit comprises a pressure regulating pipeline and further comprises a filter, a turbine flowmeter, a first pressure adjuster and a check valve which are arranged on the pressure regulating pipeline in sequence; a bleeder is arranged at a position, which is located betweenthe first pressure adjuster and the check valve, on the pressure regulating pipeline; a bleeding valve is arranged on the bleeder; the power generating unit comprises a power generating pipeline andcomprises a damper, an electromagnetic valve, a fluid motor and a second pressure adjuster which are arranged on the power generating pipeline in sequence; the fluid motor is coaxially connected witha power generator; the upstream end of the power generating pipeline is connected with the pressure regulating pipeline section between the turbine flowmeter and the first pressure adjuster; and the downstream end of the power generating pipeline is connected with the pressure regulating pipeline section between the first pressure adjuster and the bleeder. The pressure regulating and power generating device for the small-sized natural gas pipe network has the advantages of the simple structure, the high integration degree, small volume, easiness in control, safety and stability.