The invention discloses a fold line-type multifunctional door post for a
truck body. The door post is arranged in the transverse center of the
truck body, is used for connecting a roof and a underframe, is conformal to the
truck body design limit outline and is of a broken-line-shaped structure; the door post is formed by
welding an inner door post, an outer door post, a sealing plate and a baffleplate; wherein the inner door post and the outer door post are buckled and welded to form a plate folding and pressing outward-turning type cold bending groove structure, folded edges between the twosides of the inner door post and the outer door post are welded and reinforced through sealing plates, the baffle plate is vertically welded to the center of the sealing plate, and E-shaped grooves in the two sides of the cross section of the door post are formed. The door post makes full use of the side limit space of the vehicle; vehicle volume is increased, the transverse end face is in a Chinese character Ju shape, the structural space is fully facilitated, the width of the cross section of the door post is large, the height is small, the occupied space in the vehicle is small, the bending resistance is good, the
bearing capacity is high, the E-shaped groove and the side door are matched to have the flow guide function, rainwater on the roof can be drained conveniently, and safety andreliability are achieved.