The invention relates to an environment-friendly and energy-saved heat pipe air preheating device for a coal-fired boiler and a preheating method. The smoke discharge temperature of a traditional industrial boiler is generally between 160-200 DEG C; the heat loss is about 10%; and a traditional coal economizer and a traditional air preheater are easy to generate low-temperature corrosion ash deposition and ash blockage to influence normal boiler operation. The device comprises a support frame device (1), wherein a preheater mechanism is arranged above the support frame device; an air inlet pipe (2) is mounted below the preheater mechanism; an air preheating area (3) is at the left side of the front end of the preheater mechanism; an air outlet pipe (4) is mounted at the left side of the upper side of the preheater mechanism; a smoke inlet pipe (6) is mounted at the right side of the upper side of the preheater mechanism; a sound wave ash blowing connection pipe (5) is mounted at the front end of the smoke inlet pipe; and a smoke heat release area (7) is at the right side of the front end of the preheater mechanism. The invention is applied to the environment-friendly and energy-saved heat pipe air preheating device for the coal-fired boiler.