The invention discloses a pig water drinking device with a drug doser. The pig water drinking device comprises a water tank. The water tank is connected with the drug doser through a water inlet pipe,the drug doser is arranged above the water inlet pipe, fixed to a wall and connected with a water distribution pipe and a liquid mixing pipe. The water distribution pipe and the liquid mixing pipe are connected with the water inlet pipe. An electric valve a is arranged on the water distribution pipe, an electric valve b is arranged on the liquid mixing pipe, an electric valve c is arranged on a part, between the joint of the water distribution pipe and the water inlet pipe and the joint of the liquid mixing pipe and the water inlet pipe, of the water inlet pipe. The pig water drinking devicehas the advantages that drugs can be conveniently dispensed into drinking water for pigs; the pig water drinking device is simple in structure and convenient to operate; flaky solid drugs and liquid drugs can be dispensed into the drinking water simultaneously, and limitation of single drug doser is avoided.