The invention relates to the technical field of papermaking wastewater treatment, in particular to a pulp paper black liquor hyperconcentration device, a pulp paper black liquor treatment system as well as methods. According to the pulp paper black liquor hyperconcentration device, black liquor after evaporation and concentration is further concentrated, so that the quantity of steam generated through follow-up burning of the black liquor is increased. According to a black liquor treatment method, hyperconcentration is performed on the basis of steam concentration, and accordingly, greater economic benefits are generated through black liquor treatment.