This study was conducted to assess the levels and trends of environmental radiation in Shenzhen between 2011 and 2020. The monitoring encompassed dose rate, radon concentration in the air, water radioactivity, and natural radioactivity content in soil. Results indicated that the dose rate ranged from 69.3 to 131.0 nGy/h, while radon concentration was between 6.23 and 18.60 Bq/m³. The activity concentration in water, for total alpha and total beta, ranged from 0.016 to 0.225 Bq/L and 0.028 to 0.826 Bq/L, respectively. The natural radioactivity content in soil was found to be within background levels. Overall, the environmental radiation levels in Shenzhen fluctuated within the background range. To enhance the comprehensiveness of the data, it is recommended that marine radiation monitoring projects be increased and the basic data on radiation levels in Shenzhen be further refined.