The invention discloses an air feeding pipe coal powder weight measurer and a multiple-pipe balanced powder supply control system. The air feeding pipe coal powder weight measurer uses a radiation sensor and a pipe connector for measuring the air feeding pipe coal powder weight; a coal mill is used for outputting the coal powder weight to calibrate a coefficient k in a mathematical model of the coal powder weight measurer; multiple air feeding pipe coal powder weight measurers are adopted to form a coal powder weight balanced powder supply system; and an average value of multiple pipe coal powder weights is adopted as a coal powder weight set control value to perform fixed-value control over all the air feeding pipe coal powder weights to realize balanced powder supply of all air feeding pipes. Through balanced powder supply of the air feeding pipes, the combustion quality and efficiency of coal powder in a boiler are improved, and the center flame deviation and the local overheating and lagging are largely reduced. The important significance on improvement of the boiler operation stability, safety and economy is achieved.