2021年(nian)昆山市實現地區生產總值4748.06億(yi)元，按可(ke)比價(jia)計算，比上年(nian)增(zeng)長(chang)7.8%。其(qi)中，第(di)一產業(ye)增(zeng)加(jia)值31.18億(yi)元，增(zeng)長(chang)0.6%；第(di)二產業(ye)增(zeng)加(jia)值2462.74億(yi)元，增(zeng)長(chang)9.7%；第(di)三(san)(san)產業(ye)增(zeng)加(jia)值2254.14億(yi)元，增(zeng)長(chang)5.9%，三(san)(san)次產業(ye)比重為(wei)0.7:51.8:47.5。年(nian)末擁有市場主(zhu)體(ti)107.77萬戶(hu)(hu)，成為(wei)全省首(shou)個市場主(zhu)體(ti)突破100萬戶(hu)(hu)的縣級市，新登記市場主(zhu)體(ti)30.56萬戶(hu)(hu)。

2021年(nian)(nian)昆山市完成農(nong)林牧漁(yu)業(ye)(ye)總(zong)(zong)產值53.19億(yi)元(yuan)，農(nong)林牧漁(yu)業(ye)(ye)增(zeng)(zeng)(zeng)(zeng)加值34.81億(yi)元(yuan)。糧(liang)食總(zong)(zong)產量(liang)9.10萬噸，比(bi)上(shang)(shang)(shang)年(nian)(nian)增(zeng)(zeng)(zeng)(zeng)長(chang)0.8%。全(quan)(quan)年(nian)(nian)規上(shang)(shang)(shang)工業(ye)(ye)總(zong)(zong)產值首次(ci)突(tu)破萬億(yi)元(yuan)，達10284.48億(yi)元(yuan)，比(bi)上(shang)(shang)(shang)年(nian)(nian)增(zeng)(zeng)(zeng)(zeng)長(chang)12.8%。資質(zhi)以(yi)上(shang)(shang)(shang)建筑(zhu)業(ye)(ye)企業(ye)(ye)實(shi)(shi)(shi)現(xian)建筑(zhu)業(ye)(ye)總(zong)(zong)產值379.76億(yi)元(yuan)，比(bi)上(shang)(shang)(shang)年(nian)(nian)增(zeng)(zeng)(zeng)(zeng)長(chang)19.0%。全(quan)(quan)年(nian)(nian)完成固(gu)定(ding)資產投資總(zong)(zong)額(e)747.50億(yi)元(yuan)，比(bi)上(shang)(shang)(shang)年(nian)(nian)增(zeng)(zeng)(zeng)(zeng)長(chang)0.6%。全(quan)(quan)年(nian)(nian)實(shi)(shi)(shi)現(xian)社會消(xiao)費品零售總(zong)(zong)額(e)1625.68億(yi)元(yuan)，比(bi)上(shang)(shang)(shang)年(nian)(nian)增(zeng)(zeng)(zeng)(zeng)長(chang)16.3%。全(quan)(quan)年(nian)(nian)完成進出口總(zong)(zong)額(e)首次(ci)突(tu)破千億(yi)美(mei)元(yuan)，達1066.1億(yi)美(mei)元(yuan)，比(bi)上(shang)(shang)(shang)年(nian)(nian)增(zeng)(zeng)(zeng)(zeng)長(chang)22.8%，其中(zhong)出口總(zong)(zong)額(e)709.06億(yi)美(mei)元(yuan)，增(zeng)(zeng)(zeng)(zeng)長(chang)23.6%。全(quan)(quan)年(nian)(nian)累計接待游客1770.40萬人次(ci)，比(bi)上(shang)(shang)(shang)年(nian)(nian)增(zeng)(zeng)(zeng)(zeng)長(chang)57.1%。實(shi)(shi)(shi)現(xian)旅游收(shou)入259.88億(yi)元(yuan)，增(zeng)(zeng)(zeng)(zeng)長(chang)56.3%。