The invention discloses an integrated hydraulic rear carriage plate type self-discharging carriage, comprising a carriage body and a rear cover; wherein, both sides at the rear end of the carriage body are respectively provided with supporting shaft brackets; rotating arms are hinged on the tops of the supporting shaft brackets; the tails of the rotating arms are hinged with the rear cover; lifting devices are arranged between the supporting shaft brackets and the rotating arms; the lifting devices are used for lifting the rear ends of the rotating arms to open the rear cover so as to enlargethe discharging exit of the carriage. The self-discharging carriage solves the defect that when a rear turnover type dump truck is used for loading and discharging bulk materials such as stones, the rear cover is easy to be damaged by collision, and even pierces into the ground and can not discharge the bulk materials. By installing the rotating arms, after the rear cover is propped up, the discharge exit is enlarged, thus being convenient for discharging the bulk materials, accelerating discharging and improving the transport efficiency. The self-discharging carriage has simple structure andis beneficial to reconstruction of old vehicles.