Abstract: It is disclosed a two-section type waste incinerator, wherein secondary air supplying holes (27e) are provided on a front arch and a back arch of an incinerator body (27), and an ignition combustion-supporting hole (27f) is provided on the back arch of the incinerator body. Grate inside the incinerator body (27) is divided into two sections from a high point to a low point, i.e., an upper section and a lower section, the upper section is a pusher type section (6) and the lower section is a reverse pusher type section (7), and an independent primary air chamber (26) is provided under each section. All heads of the grate-pieces (3, 5) on the pusher type section (6) face toward a low point of the grate, and all heads of the grate-pieces (3, 5) on the reverse pusher type section (7) face toward a high point of the grate.