2021年(nian)(nian)鎮(zhen)海區(qu)實現地(di)區(qu)生產(chan)(chan)(chan)總值（GDP）1252.4億元，晉升到全省第(di)18位(wei)，按可比價計算(suan)，比上年(nian)(nian)增(zeng)長7.0%，其(qi)中，第(di)一產(chan)(chan)(chan)業(ye)增(zeng)加值7.0億元，增(zeng)長3.1%；第(di)二產(chan)(chan)(chan)業(ye)增(zeng)加值839.7億元，增(zeng)長7.8%；第(di)三(san)產(chan)(chan)(chan)業(ye)增(zeng)加值405.7億元，增(zeng)長5.5%。三(san)次產(chan)(chan)(chan)業(ye)之比由(you)2020年(nian)(nian)的0.6∶64.4∶35.0調整為2021年(nian)(nian)的0.6∶67.0∶32.4。

2021年(nian)鎮海區(qu)(qu)完成(cheng)(cheng)農林牧漁業總(zong)產(chan)值(zhi)(zhi)(zhi)9.87億元(yuan)(yuan)(yuan)，比上年(nian)增(zeng)(zeng)(zeng)長(chang)4.4%。全(quan)(quan)年(nian)全(quan)(quan)區(qu)(qu)完成(cheng)(cheng)規模(mo)以(yi)上工業總(zong)產(chan)值(zhi)(zhi)(zhi)3047.4億元(yuan)(yuan)(yuan)，比上年(nian)增(zeng)(zeng)(zeng)長(chang)33.7%，規模(mo)以(yi)上工業增(zeng)(zeng)(zeng)加值(zhi)(zhi)(zhi)（生產(chan)法）713.5億元(yuan)(yuan)(yuan)，增(zeng)(zeng)(zeng)長(chang)9.6%。全(quan)(quan)年(nian)全(quan)(quan)區(qu)(qu)建筑業實(shi)現(xian)增(zeng)(zeng)(zeng)加值(zhi)(zhi)(zhi)51.6億元(yuan)(yuan)(yuan)，比上年(nian)下降4.1%。全(quan)(quan)年(nian)全(quan)(quan)區(qu)(qu)完成(cheng)(cheng)固定資產(chan)投資337.9億元(yuan)(yuan)(yuan)，比上年(nian)增(zeng)(zeng)(zeng)長(chang)22.6%。全(quan)(quan)年(nian)全(quan)(quan)區(qu)(qu)完成(cheng)(cheng)商(shang)品(pin)銷(xiao)售額比上年(nian)增(zeng)(zeng)(zeng)長(chang)35.1%。全(quan)(quan)年(nian)全(quan)(quan)區(qu)(qu)實(shi)現(xian)外貿自營(ying)進出口總(zong)額621.9億元(yuan)(yuan)(yuan)，比上年(nian)增(zeng)(zeng)(zeng)長(chang)18.2%。全(quan)(quan)年(nian)全(quan)(quan)區(qu)(qu)完成(cheng)(cheng)旅游綜合收入45.2億元(yuan)(yuan)(yuan)，比上年(nian)增(zeng)(zeng)(zeng)長(chang)4.5%。