The invention relates to a flat push type self-dumping semi-trailer, belonging to the technical field of semi-trailers, solving the technical problem that in the prior art the dump semi-trailer is limited by high-altitude space constraints when the dump semi-trailer overturns or rollovers for unloading goods. The flat push type self-dumping semi-trailer includes a
carriage, wherein an opening is arranged at the
tail end of the
carriage; a baffle is arranged at the opening of the
carriage, a fixing plate is arranged in the carriage, a push mechanism is arranged on the fixing plate, a drive mechanism is arranged on the carriage, the pushing mechanism comprises a driving roller and a driven roller penetrating the fixing plate, two driving gears fixed to the driving roller, two driven gears fixed to the driven roller, two transmission chains arranged between the driving gear and the driven gear, and a plurality of flat pushrods spaced apart between the two transmission chains, the transmission chains being sleeved on the outer
peripheral surfaces of the driving gear and the driven gear. The horizontal push semi-trailer realizes automatic unloading of raw materials by driving the horizontal push rod through the transmission chain, and is not limited by the height space, thus improving its practicability.