The utility model discloses a paper pushing mechanism of a corrugated lid and tray box forming machine. The mechanism is provided with a rack and is characterized in that a first gear rack is fixed to the rack, a second gear rack is arranged above the first gear rack, a gear is arranged between the first gear rack and the second gear rack and is respectively meshed with the first gear rack and the second gear rack, a paper pushing head is arranged on the second gear rack, and the gear is connected with a reciprocating swing device through an axle. According to the paper pushing mechanism, the gear is driven through the reciprocating swing device so that the first gear rack can be driven by the gear, the second gear rack is meshed with the gear, and while the first gear rack is driven by the gear, the second gear rack is driven by the gear, so that the travel of the second gear rack is doubled in unit time. Thus, the paper pushing speed is effectively increased, in cooperation with other mechanisms of the corrugated lid and tray box forming machine, the forming efficiency of corrugated lid and tray boxes is greatly improved, the paper pushing mechanism is scientific and reasonable in structure and is applied to the corrugated lid and tray box forming machine, and the paper pushing mechanism has very good using value.