Nutrient solution injection device for grape vines

The nutrient solution injection device comprises an injection cylinder, an injection head is arranged in the middle of the left side of the injection cylinder, an extrusion piston is arranged on the left side in the injection cylinder, a push-pull rod is arranged in the middle of the right side of the extrusion piston, and a cylinder cover is arranged on the right side of the injection cylinder. The right side end of the push-pull rod penetrates through the cylinder cover and is provided with an operation plate. During injection, the injection head is pressed into a grape tree through the injection cylinder, then the length of the telescopic supporting rod is adjusted, then the use angle of the telescopic supporting rod is adjusted with the hinge as the axis, the fixing clamping ring makes contact with and is fixed to the outer portion of the grape tree branch, and therefore the injection cylinder is manufactured; the stability of the syringe in the using process is improved, and the situation that the syring