Smokeless burning equipment capable of burning undried plant-origin materials as fuel, burning waste plastics, preventing generation of smoke and reducing ash. The smokeless burning equipment comprises: a material/air inlet located close to one end of an upper wall of a burning chamber; an inlet lid for opening and closing the material/air inlet; an air outlet located close to the other end of the upper wall; a burn-promoting plate dividing the burning chamber into a primary burning chamber and a secondary burning chamber and being downwardly extended from the upper ceiling wall; a communication path communicating the primary and secondary burning chambers and being formed under the lower end of the burn-promoting plate; through-holes being dispersedly formed in the burn-promoting plate; a dry wood inlet provided to the secondary burning chamber and located under the air outlet; and a guide tube for guiding dry a dry wood, the guide tube attached to the dry wood inlet.