The invention discloses an automatic control pneumatic ash conveying system. The ash conveying system involves an ash bucket and a bin type pump, wherein a feeding valve and an exhaust valve are connected between the ash bucket and the bin type pump, the bottom of the bin type pump is provided with an air inlet and an air outlet, and the lower portion of the bin type pump is further provided witha blowing opening; a first branch compressed air pipeline, a second branch compressed air pipeline and a third branch compressed air pipeline is connected to a main compressed air pipeline, the firstbranch compressed air pipeline is provided with an air inlet valve, the second branch compressed air pipeline is provided with a gasifying valve, and the third branch compressed air pipeline is provided with an air supplementing valve; a discharging valve is arranged on a ash conveying pipeline, and the first branch compressed air pipeline is also provided with a remote transmission pressure meter; and the ash conveying system further involves a first valve controller, a second valve controller, a third valve controller, and a fourth valve controller which control the ash conveying operation automatically. The ash conveying system has the advantages that the ash conveying efficiency is high, the ash conveying pipeline is not easy to block, and the waste of compressed air cannot be caused in the ash conveying process.