The utility model discloses a diesel engine injection pump overhauls device. This maintenance device includes: fixed platform, fixed plate, bayonet lock, spring, rotor plate, mounting panel and hold -down mechanism, wherein, fixed platform along horizontal direction setting, vertical direction setting is followed to the fixed plate, and it links to each other with fixed platform, be provided with on the fixed plate along the pinhole of horizontal direction setting, the bayonet lock sets up in the pinhole, the bayonet lock periphery is located to the spring housing, the rotor plate articulates along vertical direction setting, its and fixed plate, it is rotatory that vertical face can be followed to the rotor plate, be provided with the rotational positioning hole that can hold the bayonet lock and wear to establish on the rotor plate, after the angle was predetermine in the rotor plate rotation, the rotational positioning hole was relative with the pinhole position, the horizontal direction setting is followed to the mounting panel, and it links to each other with the rotor plate, hold -down mechanism links to each other with fixed platform, and it is provided with can follow horizontal direction and vertical direction position adjustable pressure head. Adopt this maintenance device to need not the relapse elasticity of bench vice and moving of injection pump, guarantee the safety of maintenance, improve maintenance efficiency.