The invention provides an equal-resistance uniform-flow preheating backwater condensation type heat exchanger. An efficient module furnace condenser comprises an upper mother pipe, a lower mother pipe and a plurality of equal-length division water pipes which are used for waterflow circulation, wherein the division water pipes communicate with the upper mother pipe and the lower mother pipe; a water inlet pipe is arranged on the upper mother pipe; a water outlet pipe is arranged on the lower mother pipe; and the water inlet pipe and the water outlet pipe are distributed diagonally, so that the water inlet pipe, the upper mother pipe, the division water pipes, the lower mother pipe and the water outlet pipe form an equal-resistance uniform-flow waterflow channel. According to the equal-resistance uniform-flow preheating backwater condensation type heat exchanger, the heat energy loss of preheated water is reduced, water inside the condenser is fully utilized to fully absorb sensible heat of high temperature exhaust fume of a gas module and latent heat released by water vapor condensation, the heat efficiency of the gas module is improved, and ideal energy conservation and environment protection effects are achieved.