Multi-cavity combustion fast heating-up bathroom-specific furnace

The invention discloses a multi-cavity combustion fast heating-up bathroom-specific furnace, wherein a casing (1) and an inner container (2) are sleeved to form a jacketed furnace body which is divided through a furnace grate (20) into an upper portion as a heating chamber and a lower portion as a combustion chamber, the heating chamber is internally equipped with a fire tube (3), the top of the furnace body is equipped with a cupola tube (4), the furnace body is internally equipped with water tubes (5), partition boards are mounted at interval from bottom to top between the casing (1) and the inner container (2) in order to form a plurality of heat absorption cavities (11), the water tubes (5) are arrayed and mounted from bottom to top within the furnace body in a snakelike way, an water inlet (14) positioned at the bottom of the casing is communicated with the water tube at the lowest layer, and a water outlet (15) positioned at the top of the casing is communicated with the water tube at the highest layer.