The invention discloses a crude oil and fuel gas rotational flow low-nitrogen burner of a steam-injection boiler for burning crude oil and fuel gas. According to the air flowing direction, the crude oil and fuel gas rotational flow low-nitrogen burner sequentially comprises an air inlet, a control damper, a center air chamber, secondary air chambers, surrounding air chambers, a secondary air spraying opening and a surrounding air spraying opening. Center air sequentially flows through the center air chamber, a center air tube and the burner. Secondary air sequentially flows through one secondary air chamber, a secondary air spinning disk, the other secondary air chamber and the secondary air spraying opening. Surrounding air sequentially flows through one surrounding air chamber, the other surrounding air chamber and the surrounding air spraying opening. According to the burner, burning air is reasonably graded and organized, graded burning of crude oil and fuel gas is achieved, generation of nitric oxide is effectively reduced, and nitrogen discharging is reduced; and in addition, the crude oil and fuel gas rotational flow low-nitrogen burner is simple in system, easy to maintain, low in maintenance cost and long in service life.