The utility model relates to a diesel engine's urea pipe holder, including a frame to it has support holder to the side extension to follow the frame bottom, and the frame passes through crossbeam no. 1, two connections on the crossbeam, and even as an organic whole with support holder through crossbeam no. 3, frame lateral beam has water valve bracket through the bolt fastening once, and its normal water valve bracket is in the frame, being equipped with the sprayer support on the perpendicular limit of frame no. 1, being equipped with air filter support on erecting limit no. 2, sprayer support and air filter support are relatively at the frame side, support holder then is the urea pipe holder to upwards be equipped with flexible bandage from support holder's distal end, the final swing joint of flexible bandage is to the perpendicular limit of frame no. 2 on. The utility model discloses an installation of frame rack structure and two integral type structures for compact structure, it is easy to assemble.