The invention relates to a sampler of an environment-friendly drilling fluid treating agent. A sharp sampling bath is arranged in the front of a sampling bath and a baffle plate is arranged at the end of the sampling bath. A handle of the sampler is connected to one side of the baffle plate. A discharging opening is prefabricated at the bottom of the sampling bath near the baffle plate. A material receiving funnel is arranged below the discharging opening. According to said solution, the sampler further comprises a lock sleeve of a sampling bag, which is connected to the outside of the material receiving funnel. The handle of the sampler is cylindrical in shape. A sampling push rod passes through the handle of the sampler, the baffle plate and the sharp sampling bath in the front of the sampling bath and is connected to a sampling spoon. According to the invention, sealing connection between the sampler and the sampling bag is realized through the material receiving funnel and the lock sleeve of the sampling bag; the sampling spoon arranged inside the sampler is used for collecting the drilling-fluid treating agent; the drilling-fluid treating agent can be sampled fast under various severe environments; and sampling workers and environment can be protected from harm.