The invention provides a conveying system of coal mine ventilation air methane. The conveying system of the coal mine ventilation air methane comprises an air shaft diffusion tower, a ventilation air methane collecting device, a first ventilation air methane transfer passage and a second ventilation air methane transfer passage. A gas inlet of the first ventilation air methane transfer passage is communicated with a coal mine air shaft. A lower end opening of the air shaft diffusion tower is communicated with an exhaust port of the first ventilation air methane transfer passage. The ventilation air methane collecting device covers the upper portion of the air shaft diffusion tower and is fixedly connected to the outside of the side wall of the air shaft diffusion tower. A ventilation hole is formed in the side wall of a cover body of a wind collecting cover in the ventilation air methane collecting device, and internal space of a tube body of the air shaft diffusion tower is communicated with a gas inlet of the second ventilation air methane transfer passage through the ventilation hole. An exhaust port of the second ventilation air methane transfer passage is communicated with ventilation air methane utilization equipment. By means of the conveying system of the coal mine ventilation air methane, the ventilation air methane in a shaft can be conveyed, and a gas source is provided for utilization, for instance, gas in ventilation air methane flow is used as fuel for combustion-supporting and catalytic oxidation of the ventilation air methane.