2021年(nian)鎮海區(qu)實現地區(qu)生(sheng)產(chan)總值（GDP）1252.4億元(yuan)，晉(jin)升到全省第(di)18位，按可(ke)比(bi)(bi)價計(ji)算，比(bi)(bi)上年(nian)增(zeng)長(chang)7.0%，其中(zhong)，第(di)一產(chan)業(ye)(ye)增(zeng)加值7.0億元(yuan)，增(zeng)長(chang)3.1%；第(di)二(er)產(chan)業(ye)(ye)增(zeng)加值839.7億元(yuan)，增(zeng)長(chang)7.8%；第(di)三產(chan)業(ye)(ye)增(zeng)加值405.7億元(yuan)，增(zeng)長(chang)5.5%。三次產(chan)業(ye)(ye)之比(bi)(bi)由2020年(nian)的0.6∶64.4∶35.0調整(zheng)為2021年(nian)的0.6∶67.0∶32.4。

2021年(nian)(nian)鎮(zhen)海區完(wan)成(cheng)農林牧(mu)漁業(ye)(ye)總產值9.87億(yi)元(yuan)(yuan)，比(bi)(bi)上(shang)(shang)年(nian)(nian)增長(chang)4.4%。全(quan)(quan)(quan)年(nian)(nian)全(quan)(quan)(quan)區完(wan)成(cheng)規模(mo)以上(shang)(shang)工業(ye)(ye)總產值3047.4億(yi)元(yuan)(yuan)，比(bi)(bi)上(shang)(shang)年(nian)(nian)增長(chang)33.7%，規模(mo)以上(shang)(shang)工業(ye)(ye)增加值（生產法）713.5億(yi)元(yuan)(yuan)，增長(chang)9.6%。全(quan)(quan)(quan)年(nian)(nian)全(quan)(quan)(quan)區建筑業(ye)(ye)實現增加值51.6億(yi)元(yuan)(yuan)，比(bi)(bi)上(shang)(shang)年(nian)(nian)下降4.1%。全(quan)(quan)(quan)年(nian)(nian)全(quan)(quan)(quan)區完(wan)成(cheng)固定資產投資337.9億(yi)元(yuan)(yuan)，比(bi)(bi)上(shang)(shang)年(nian)(nian)增長(chang)22.6%。全(quan)(quan)(quan)年(nian)(nian)全(quan)(quan)(quan)區完(wan)成(cheng)商品銷售額比(bi)(bi)上(shang)(shang)年(nian)(nian)增長(chang)35.1%。全(quan)(quan)(quan)年(nian)(nian)全(quan)(quan)(quan)區實現外貿自營進出口總額621.9億(yi)元(yuan)(yuan)，比(bi)(bi)上(shang)(shang)年(nian)(nian)增長(chang)18.2%。全(quan)(quan)(quan)年(nian)(nian)全(quan)(quan)(quan)區完(wan)成(cheng)旅游綜合(he)收入45.2億(yi)元(yuan)(yuan)，比(bi)(bi)上(shang)(shang)年(nian)(nian)增長(chang)4.5%。