The invention provides a pressure reducing device and a dispensing controller provided with the same. The pressure reducing device comprises a pressure reducing valve, a control module and a special-shaped pipe joint. The pressure reducing valve is provided with an air inlet, an air outlet and an exhaust port, the air inlet is connected to an air pressure source, and the air outlet is connected toa load to provide an output air pressure to the load; the control module is electrically connected to the pressure reducing valve, and the control module sends an electric signal to the pressure reducing valve to set the output air pressure of the pressure reducing valve; a tube cavity penetrating axially is defined in the special-shaped pipe joint, one or more air flow channels communicating tothe pipe cavity are formed on the outer wall surface of the special-shaped pipe joint, and one end of the special-shaped pipe joint is connected to the load while the other end of the special-shaped pipe joint is connected to the air outlet. The pressure reducing device according to the embodiment of the invention is simple in structure, can weaken overshoot of the output air pressure and recoverthe output air pressure higher than the set air pressure to be consistent to the set air pressure within a shorter time, and particularly can enhance the consistence of working air pressure when the dispensing controller dispenses glue at a high speed repeatedly.