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This invention discloses a coal powder concentration leveling device for coal-fired power plant coal powder pipelines. At least one bypass pipe is connected in parallel to each main air-coal pulverizer pipeline (03) on the coal mill, running from the separator (01) upwards to the mixer (02) and then to each main pulverizer pipe (03). Alternatively, two bypass pipes with opposite flow directions can be used to connect the main pulverizer pipes (03) above each mixer (02). The diameter of the bypass pipe is significantly smaller than the diameter of the main pipe. An ejector (04) is installed on each bypass pipe, and the suction action of the ejector (04) is used to balance the powder concentration between the pipelines. A method for leveling coal powder concentration in coal-fired power plant coal powder pipelines is also disclosed. First, a bypass structure is set up; then, an ejector (04) is connected to each bypass pipe, and the suction action of the ejector is used to balance the powder concentration between the pipelines. This invention has the beneficial effect of more efficient and stable coal powder leveling.