To provide an exhaust gas purifying equipment for a marine diesel engine which can achieve size reduction of a cyclone, and a high-PM collection efficiency and a low fuel consumption. The exhaust gas purifying equipment for a marine diesel engine includes a discharging electrode for charging particulate matter contained in exhaust gas of a marine diesel engine and a tubular collecting part for collecting charged particulate matter, and further includes a precipitation means for separating and collecting particulate matter detached from the tubular collecting part, characterized in that a PM low-concentration exhaust gas delivery pipe and a PM high-concentration exhaust gas delivery portion are provided on a downstream side of the tubular collecting part thereof, a recirculation pipe for recirculating purified gas is provided from the precipitation means for collecting particulate matter provided on the PM high-concentration exhaust gas delivery portion to between the marine diesel engine and the tubular colle
