The invention discloses a multi-station balanced pressing mechanism for a gas-liquid conversion cylinder. The multi-station balanced pressing mechanism can guarantee the balanced press force of all stations and comprises a cylinder. The cylinder is controlled by an electromagnetic valve to be ventilated or not. A first sealing pad is arranged in the cylinder and divides the cylinder into a left cavity and a right cavity. The right cavity is provided with a pipe cavity protruding outwards. A second sealing pad is arranged in the pipe cavity and used for separating the pipe cavity and an oil cavity of an oil cylinder. The right side of the oil cylinder is communicated with an oil chamber through a pipeline. Four piston cavities are arranged side by side at the lower portion of the oil chamber at equal intervals. Pistons capable of moving axially along the piston cavities are arranged in the piston cavities and provided with sealing rings for preventing hydraulic oil from seeping downwards. The lower ends of the pistons are connected with piston rods. The diameters of all the piston rods are the same. Reset springs are arranged on the peripheries of the piston rods. Pressing boards are arranged at the lower ends of the piston rods.