A heating body, applied to an electronic atomizing device and configured to heat and atomize an aerosol-generation substance, and the heating body comprising: a dense substrate, comprising a liquid absorbing surface and an atomizing surface arranged opposite to each other; wherein a plurality of micropores are defined on the dense substrate, and the plurality of micropores extend through from the liquid absorbing surface to the atomizing surface, and the atomizing surface is a wetting structure on which surface treatment is performed, and the wetting structure is fluidly coupled to the plurality of micropores; wherein the atomizing surface comprises a first concave-convex structure to form the wetting structure, the first concave-convex structure comprises a plurality of first grooves and a plurality of second grooves, and the plurality of first grooves and the plurality of second grooves are fluidly coupled to the plurality of micropores; the plurality of first grooves are defined parallel to each other, the length direction of the plurality of first grooves is parallel to a first direction, the plurality of second grooves are defined parallel to each other, the length direction of the plurality of second grooves is parallel to a second direction; and a bump is arranged between two adjacent first grooves and between two adjacent second grooves; wherein the first direction intersects with the second direction; it is characterized in that the heating body further comprises a heating component, the heating component comprises a first part, a second part, a third part, and a fourth part, the first part is arranged on the side wall and the bottom wall of each of the plurality of first grooves, the second part is arranged on the side wall and the bottom wall of each of the plurality of second grooves, the third part is arranged on an end surface of each of the plurality of bumps that is away from the liquid absorbing surface, and the fourth part extends to the pore wall of a corresponding micropore. a dense substrate, comprising a liquid absorbing surface and an atomizing surface arranged opposite to each other; wherein a plurality of micropores are defined on the dense substrate, and the plurality of micropores extend through from the liquid absorbing surface to the atomizing surface, and the atomizing surface is a wetting structure on which surface treatment is performed, and the wetting structure is fluidly coupled to the plurality of micropores; wherein the atomizing surface comprises a first concave-convex structure to form the wetting structure, the first concave-convex structure comprises a plurality of first grooves and a plurality of second grooves, and the plurality of first grooves and the plurality of second grooves are fluidly coupled to the plurality of micropores; the plurality of first grooves are defined parallel to each other, the length direction of the plurality of first grooves is parallel to a first direction, the plurality of second grooves are defined parallel to each other, the length direction of the plurality of second grooves is parallel to a second direction; and a bump is arranged between two adjacent first grooves and between two adjacent second grooves; wherein the first direction intersects with the second direction; it is characterized in that the heating body further comprises a heating component, the heating component comprises a first part, a second part, a third part, and a fourth part, the first part is arranged on the side wall and the bottom wall of each of the plurality of first grooves, the second part is arranged on the side wall and the bottom wall of each of the plurality of second grooves, the third part is arranged on an end surface of each of the plurality of bumps that is away from the liquid absorbing surface, and the fourth part extends to the pore wall of a corresponding micropore.