A steam injection boiler with a dual-return circulation pipeline comprises a steam system composed of a high-pressure plunger pump, a water supply pipe, a steam discharging tube, a mixer and two circulation pipelines. Each circulation pipeline is composed of a radiation tube bundle, a convection tube bundle, and a feed-water pre-heater, the high-pressure plunger pump is mounted on the water supply pipe, the outlet of the mixer is communicated with the steam discharging tube, the feed-water pre-heater is composed of a shell and an inner sleeve, while the shell is provided with a shell side inlet and a shell side outlet, the inner sleeve is provided with a tube side inlet and a tube side outlet, the shell side inlet is communicated with the water supply pipe while the shell side outlet is communicated with the inlet of the convection tube bundle which outlet is communicated with the tube side inlet, the tube side outlet is communicated with the inlet of the radiation tube bundle which outlet is communicated with the inlet of the mixer. The utility model distributes the two circulation pipelines symmetry, with simple and compact structure and high heat efficiency, which can significantly improve nominal evaporative capacity and output 14MPa high-temperature steam of 50t in unit hour, to feed enough steam to steam assisted gravity drainage.