The invention discloses a porous medium smoldering type liquid fuel burner and belongs to the technical field of boiler burners. The porous medium smoldering type liquid fuel burner comprises an atomizer, an atomization chamber, an air supply channel, a blowing device and a porous medium body. The atomizer comprises an oil pump, an oil pipe and a sprayer. The oil pump is connected with the sprayer through the oil pipe, the sprayer is installed in a pre-burning chamber, and an electronic ignition sleeve is installed in the pre-burning chamber. One end of the air supply channel is connected with the atomization chamber, and the other end of the air supply channel is connected with an air blower through welding flanges. The blowing device is arranged at the bottom of the atomization chamber, the blowing device is composed of a blowing pipe and the air blower, and the blowing pipe and the air blower are connected through connecting flanges. The porous medium body is fixed to the barrel wall of the atomization chamber through a bolt. The barrel wall of the atomization chamber is welded to a boiler hearth through flanges. The problems that in the prior art, a burner cannot continuously and stably supply fuel and a proper amount of air, and normal and stable burning of the fuel cannot be guaranteed are solved.