The invention discloses an agricultural mechanical water tank capable of detecting the temperature and turbidity of the water tank. The agricultural mechanical water tank structurally comprises a steam outlet, a water quality alarming device, a water tank water inlet, a water tank top cover, a top cover fixing frame, a water tank reinforcing frame, fixing bolts, water tank cooling fins, reinforcing beams, a water tank base, a water tank water outlet, base supporting feet and a radiating leaf reinforcing beam. The steam outlet is positioned in the right side face of the water quality alarming device. According to the agricultural mechanical water tank capable of detecting the temperature and turbidity of the water tank, the water quality alarming device is arranged in structure; when the water quality in the water tank becomes turbid, a water quality sensor senses the changes of the water quality, an electric signal is sent to an information processor through an electric control wire, an electromagnet is de-energized through the information processor, an adsorption block is pushed by a reset spring, a lower current contact is in contact with an upper current contact for energization, an alarming loudspeaker gives out an alarm, and water in the water tank is replaced in time, so that the heat dissipation function runs normally.