The invention belongs to the technical field of dosage measurement, and discloses a two-pi multi-wire gas-flow proportional counter. The counter is of a plate-type drawer structure and mainly comprises a counter shell, anode wires, an anode wire frame, insulation frameworks and a source drawer, wherein the counter shell is a square frame composed of an upper cover plate and shell side walls, the source drawer goes into and out of the counter shell through a guide rail, each shell side wall is provided with an air inlet and an air outlet, the anode wire frame is a square frame and is located between the upper insulation framework and the lower insulation framework, the lower insulation framework is fixed to the shell side walls, the upper insulation framework is located below the upper cover plate, the edges of the upper portions of the shell side walls are provided with a sealing ring, the upper cover plate is fixedly connected with the shell side walls, the anode wires are fixed to the anode wire frame, and the anode wires are gold-plated tungsten wires distributed at equal intervals in parallel. The counter has the advantages that the effective detection area is as large as 1000 square centimeters, the anode wires are distributed in parallel, gas disturbance is little, and electric fields are uniformly distributed.