The invention discloses a plate grid ejection mechanism of a lead-acid battery plate grid die casting machine, and the mechanism comprises a fixed framework and a movable framework, wherein two working shafts which are parallel mutually and are arranged at an interval and a driving device for driving the working shafts to rotate are arranged on the fixed framework; and the movable framework is supported on an eccentric mechanism arranged on the two working shafts and can rotate in a reciprocating manner along with the two working shafts under the drive of the driving device, and the eccentricmechanism on the working shafts is used for pushing the movable framework to enable a thimble carried on the movable framework to move up and down. The plate grid ejection mechanism of the lead-acid battery plate grid die casting machine can regulate the ejection time, ejection speed and ejection distance of the thimble according to the requirements; furthermore, the smooth lifting and smooth falling of the thimble can be ensured on the structure, and the balanced and smooth ejection of a plate grid can be further ensured; and in addition, the plate grid ejection mechanism further has the advantages of simple structure, convenience in manufacturing, convenience in maintenance and mounting, smooth and reliable actions, high controllability and the like, thereby creating conditions for realizing automatic production of a whole plate grid production line.