Automatic water adding system of watering cart

The automatic water adding system comprises the watering cart and further comprises a fixing pile, a water adding pipeline, a telescopic pipe and a water resisting layer, a water storage tank is fixedly installed on the watering cart, and a water adding hole is formed in the tank wall, away from the ground, of the water storage tank; the fixed pile is fixedly arranged on the ground, the water adding pipeline is fixedly installed on the fixed pile, the input end of the water adding pipeline selectively communicates with a water source, and the output end of the water adding pipeline is located above the fixed pile; the output end of the water adding pipeline vertically faces the ground, the telescopic pipe is arranged at the output end of the water adding pipeline in a sliding and sleeving mode, and the telescopic pipe communicates with the water pipeline; the watering cart selectively moves to the side, close to the telescopic pipe, of the fixed pile, and the water adding hole is located below the output end