The utility model discloses an adjustable water resource monitoring device, and belongs to the technical field of water resource monitoring. An adjustable water resource monitoring device comprises awater inlet pipe and a water outlet pipe, and further comprises a regulation and control assembly, a speed reducing pipe and a monitoring assembly. The utility model relates to an adjustable water resource monitoring device. Existing water resource monitoring equipment has certain defects. Monitoring equipment such as a water quality detector is usually fixedly mounted; the water flow cannot be adjusted inside; the service life of the monitoring equipment is shortened; simultaneously, water flow is unstable, a certain error exists in the monitoring data; therefore, the regulation and control assembly is arranged at the front end of the water inlet pipe, the water flow entering the water inlet pipe is limited through the regulation and control assembly, the water flow is further reduced through the special structure in the speed reducing pipe, water resources flowing through the interior of the monitoring assembly stably flow accordingly, the internal structure of the monitoring assembly is protected, and monitoring of the monitoring assembly is more accurate.