The invention relates to the field of urban household waste incineration, in particular to a high-temperature and high-pressure waste incineration pi type boiler. The boiler comprises a water-coolingcombustion chamber, a first channel, a first and second channel connecting channel, a second channel, a third channel, a horizontal channel and a fourth channel, wherein the first channel, the first and second channel connecting channel, the second channel, the third channel, the horizontal channel and the fourth channel are arranged in the flue gas flowing direction in sequence, wherein a platensuperheater is arranged on the upper portion of the second channel, and the outer portion of the platen superheater is coated with high-heat-conduction plastic refractory; an evaporation protector I is arranged on the lower portion of the third channel; the horizontal channel is internally provided with an evaporation protector II, a high-temperature superheater, an intermediate-temperature superheater and a low-temperature superheater in sequence; and an economizer is arranged in the fourth channel. According to the high-temperature and high-pressure waste incineration pi type boiler, the platen superheater is coated with the high-heat-conduction plastic refractory to isolate contact between a pipe and flue gas, and the problem of high-temperature corrosion is solved thoroughly. The platen superheater can heat steam to 540 DEG C. Accordingly, the thermal efficiency of a matched waste incineration power plant steam turbine generator unit system is improved to 34%.