The invention discloses a coaxial threaded pipe leakage flow type heat exchanger and belongs to the field of heat exchange devices. The coaxial threaded pipe leakage flow type heat exchanger comprises an outer pipe and an inner pipe, wherein the outer pipe and the inner pipe are coaxially arranged. The inner pipe is a multi-head helical corrugated pipe. A plurality of concave structures are arranged on a helical protruding rib structure of the inner pipe at intervals. An internal leakage area is formed by the concave structures, so that disturbance on fluid in a fluid channel between the inner pipe and the outer pipe is reinforced, and the heat exchange efficiency is improved. According to the coaxial threaded pipe leakage flow type heat exchanger, the size of the heat exchanger is reduced, and the heat exchange efficiency of the heat exchanger is improved.