The BM@N experiment is a part of the NICA accelerator complex at the Joint Institute for Nuclear Research, Dubna. The main goal of the research program on this detector is to study the interactions of relativistic heavy ion beams with fixed targets. BmnRoot software is used to process both experimental and simulated data. Not all the detectors, however, are included in the reconstruction chain. One of them is the Multi-Wire Proportional Chamber (MWPC). Here we present the description of the MWPC detector geometry and the algorithms for digitizing, hit finding and track reconstruction. The results of simulation are given.