The invention relates to a pressure-resistant combined fuel tank with a two-column plastic pipe. The pressure-resistant combined fuel tank is characterized in that: a fuel tank body is arranged on one side of the combined fuel tank; a urea reductant pressure-resistant pipe body is arranged in the center of the combined fuel tank; an electric control box is arranged on the other side of the combined fuel tank; a seaming end cover pinch plate is arranged on one side of the electric control box; the fuel tank and the electric control box combined fuel tank is formed by welding stainless steel plates integrally; and each stainless steel plate is 1.2 to 1.5mm thick and is made of SUS304 or SUS441. The pressure-resistant combined fuel tank makes a box body have three functions, realizes a compact design, contributes to the beautiful design of a vehicle, reduces the installation of connecting pieces, simplifies vehicle allocation, reduces weight, meets the requirement of selective catalytic reduction (SCR) standards over China IV, and reduces system cost.