2021年鎮海區(qu)實現地區(qu)生產(chan)總值(zhi)(zhi)（GDP）1252.4億元(yuan)，晉升到(dao)全省第18位(wei)，按可比(bi)(bi)價計算(suan)，比(bi)(bi)上年增長(chang)7.0%，其(qi)中(zhong)，第一產(chan)業增加(jia)(jia)值(zhi)(zhi)7.0億元(yuan)，增長(chang)3.1%；第二產(chan)業增加(jia)(jia)值(zhi)(zhi)839.7億元(yuan)，增長(chang)7.8%；第三產(chan)業增加(jia)(jia)值(zhi)(zhi)405.7億元(yuan)，增長(chang)5.5%。三次產(chan)業之比(bi)(bi)由2020年的0.6∶64.4∶35.0調整為2021年的0.6∶67.0∶32.4。

2021年(nian)(nian)(nian)鎮海區(qu)(qu)完成(cheng)(cheng)農林牧漁業(ye)(ye)(ye)(ye)總產(chan)值9.87億(yi)(yi)元，比(bi)上(shang)年(nian)(nian)(nian)增(zeng)(zeng)(zeng)長(chang)(chang)4.4%。全(quan)(quan)(quan)年(nian)(nian)(nian)全(quan)(quan)(quan)區(qu)(qu)完成(cheng)(cheng)規模以上(shang)工(gong)(gong)業(ye)(ye)(ye)(ye)總產(chan)值3047.4億(yi)(yi)元，比(bi)上(shang)年(nian)(nian)(nian)增(zeng)(zeng)(zeng)長(chang)(chang)33.7%，規模以上(shang)工(gong)(gong)業(ye)(ye)(ye)(ye)增(zeng)(zeng)(zeng)加值（生產(chan)法）713.5億(yi)(yi)元，增(zeng)(zeng)(zeng)長(chang)(chang)9.6%。全(quan)(quan)(quan)年(nian)(nian)(nian)全(quan)(quan)(quan)區(qu)(qu)建筑業(ye)(ye)(ye)(ye)實現增(zeng)(zeng)(zeng)加值51.6億(yi)(yi)元，比(bi)上(shang)年(nian)(nian)(nian)下降(jiang)4.1%。全(quan)(quan)(quan)年(nian)(nian)(nian)全(quan)(quan)(quan)區(qu)(qu)完成(cheng)(cheng)固定(ding)資(zi)產(chan)投資(zi)337.9億(yi)(yi)元，比(bi)上(shang)年(nian)(nian)(nian)增(zeng)(zeng)(zeng)長(chang)(chang)22.6%。全(quan)(quan)(quan)年(nian)(nian)(nian)全(quan)(quan)(quan)區(qu)(qu)完成(cheng)(cheng)商品銷售額比(bi)上(shang)年(nian)(nian)(nian)增(zeng)(zeng)(zeng)長(chang)(chang)35.1%。全(quan)(quan)(quan)年(nian)(nian)(nian)全(quan)(quan)(quan)區(qu)(qu)實現外貿自營進(jin)出口總額621.9億(yi)(yi)元，比(bi)上(shang)年(nian)(nian)(nian)增(zeng)(zeng)(zeng)長(chang)(chang)18.2%。全(quan)(quan)(quan)年(nian)(nian)(nian)全(quan)(quan)(quan)區(qu)(qu)完成(cheng)(cheng)旅游綜(zong)合收入45.2億(yi)(yi)元，比(bi)上(shang)年(nian)(nian)(nian)增(zeng)(zeng)(zeng)長(chang)(chang)4.5%。