The invention discloses a hydrodynamic scraper conveyor. The scraper conveyor comprises a speed reducer, a machine head, a material box, a scraper assembly mechanism and a motor, wherein the machine head is arranged at one end of the material box, the machine head is obliquely arranged, the machine head and the material box are connected in a sealed mode to form a closed integral structure, and ascraper assembly is arranged in the machine head. According to the scraper conveyor, the large material box is arranged at one end of the scraper conveyor, so that the structure is reasonable, the volume is large, the material sorting efficiency is high, and the problem that large-capacity materials can not be completely sorted is solved; a torsion arm is arranged on a shell of the speed reducer,and one end of the torsion arm is connected with a fixed position, so that the shell of the speed reducer is prevented from being rotated; the gravity of the motor and the speed reducer is completelypressed on a shaft for a long time and the shaft can not be deformed, and the balance transition of the torsion and a corner is increased, so that the motor is well protected and stabilized, the overload capacity is high, the impact resistance is realized, and the inertia moment is small; and a tail part mounting maintaining sealing plate is arranged at one end of the material box so that the material box can be conveniently opened and convenient to maintain.