The invention provides a basement bottom plate marsh gas leaking point reinforcing sealing structure and a processing method. The processing method comprises the following steps: pre-burying a marsh gas drain pipe at a basement bottom plate, forming an opening in the top end of the marsh gas drain pipe to form marsh gas drain holes, forming observation holes in the rest of marsh gas leaking pointsof the basement bottom plate, wherein the reserved marsh gas drain holes comprise at least one pulp filling hole and observation hole, digging the two sides of the upper end of the marsh gas drain pipe to form a trough body and cutting off the upper end of the marsh gas drain pipe; filling the pulp filling holes with cement paste and water glass and stopping filling when the pulp bursts out of the observation holes; after pulp filling, sealing the marsh gas drain pipe, filling, sealing and reinforcing the trough body and filling and sealing the marsh gas leaking points; and laying chemical stick steel above each sealed marsh gas leaking point and adopting chemical anchor bolts for reinforcement. According to the method, construction is convenient and the problem that the basement bottom plate leaks marsh gas can be effectively solved.