The invention provides a subway submerging-prevention tunnel comprising a subway station foundation pit, subway entrance bosses and a drainage system. The subway station foundation pit is of an inverted trapezoidal structure; a plurality of diversion trenches are formed in the two side walls of the inverted trapezoidal structure, and the diversion trenches in the same side are converged to a waterstorage pit; catchment channels are formed in the two sides of the bottom of the inverted trapezoidal structure and communicate with the outside world through water suction pumps; and diversion passages are formed in the peripheries of the subway entrance bosses and communicate with sewers. The situation that rainwater enters the tunnel is avoided, dredging drainage and diversion are conducted onexternal water, infiltration water is collected and drained, the entering water is converged and pumped out, and thus the safety of tunnel main body equipment is ensured.