The utility model relates to a chain plate installer of a chain. The chain plate installer of the chain is characterized in that a thread lead screw is arranged at the front end of a cylinder body of a manual hydraulic jack, a plunger rod is arranged inside a cavity of the thread lead screw, a pressurization handle is arranged at the rear end of the manual hydraulic jack, a flange plate is connected onto the thread lead screw in revolving mode, two connecting rods are respectively inserted in two through holes in the upper portion and the lower portion of the flange plate, the other ends of the two connecting rods are respectively inserted into two through holes in the upper direction and the lower direction of a cross, the horizontal direction axis of the cross is parallel to a plane where a chain to be dismantled is located, a chain plate press block is installed at the front end of the plunger rod, the length direction axis of the chain plate press block is parallel to the horizontal direction axis of the cross, the front end face of the chain plate press block is provided with a chain plate groove which fits a chain plate to be installed both in shape and size, the bottom of the chain plate groove is provided with two counter bores, and bore diameters and positions of the two counter bores respectively fit those of two axis pin holes of the chain plate to be installed. The chain plate installer of the chain can quickly install the chain plate, is high in work efficiency, and prolongs service life of the chain.