The utility model provides a guiding mechanism and image forming device of scanning element, this guiding mechanism includes integratively: the clamping part, for the groove structure of U -shaped twocurb plates in U -shaped groove are provided with the support that is used for supporting the reflector respectively and swell and swell the stopper that the direction is extended to the support, andthe fixed part, be in including the vertical fixation the clamping part set up the fixed plate on the lateral surface of the curb plate of stopper and set up the middle part of fixed plate to clamping part opening direction is stretched out and is formed the cardboard in centre gripping space with the fixed plate. The utility model discloses by the formation after turn the corner rolls over of awhole board, the messenger realizes that each parts of regulatory function combine together, through the structure of movable centre gripping, can located to break away from by clamping position fastto along with a dismantlement of reflector, the regulation of reflector angle is carried out in the narrow and small space in inside that conveniently breaks away from image forming device.