Large machinery bottom maintenance vehicle with illuminating function

The invention discloses a large machinery bottom maintenance vehicle with an illuminating function. The large machinery bottom maintenance vehicle comprises a maintenance vehicle body, wherein a working cavity with an upward opening is arranged in the upper end surface of the maintenance vehicle body; an illuminating mechanism is arranged in the working cavity; the illuminating mechanism comprisesa supporting block; a connecting cavity which penetrates through upper and lower end surfaces of the supporting block is arranged in the supporting block; and a placing block which penetrates throughthe upper end wall of the connecting cavity is arranged in the connecting cavity. The large machinery bottom maintenance vehicle adopts a plate trailer form design, is small in size, is flexible to move, can be used as a moving tool of a maintenance man while used for maintaining the bottom of large machinery, so that clothes of the maintenance man are prevented from being contaminated; a place for containing a flashlight