The invention relates to a continuous forming device of a biaxial orientation polyvinyl chloride pipe and an operating method. The continuous forming device of the biaxial orientation polyvinyl chloride pipe comprises an outer mold, a core mold, a pipe blank cooling system and a double orientation stretch forming system; the pipe blank cooling system comprises a low pressure air inlet pipe, a guide post, a separator, a temperature-adjustable water immersion type tank and a seal ring; the double orientation stretch forming system comprises a tapered orientation mold, a sizing cooling tank, a high pressure air inlet pipe, a tractor, a seal airbag and an airbag pull rod. By adopting the continuous forming device of the biaxial orientation polyvinyl chloride pipe, an extruded pipe blank not reaching vitrification temperature is cooled evenly, and the inner stress of the pipe blank is removed; the support of the pipe to the tractor is increased, the traction balance is ensured, and thus the stableness and reliability of continuous production of the pipe is ensured.