A control method of a gypsum board forming system, wherein the gypsum board forming system comprises an operation screen, a central processor, a wet material adding device, a dry material adding device, a mixer and a forming device, wherein the operation screen, the wet material adding device, the dry material adding device, the mixer and the forming device are all electrically connected with the central processor; wherein the wet material adding device comprises a foaming agent tank, a foaming agent motor, a pulp water tank, a pulp water motor, a pulp water flowmeter, a stirring water tank, a stirring water motor and a stirring water flowmeter, wherein the foaming agent motor is connected with the foaming agent tank, the pulp water motor is connected with the pulp water tank, the pulp water flowmeter is located at a discharge outlet of the pulp water tank and is electrically connected with the central processor; the stirring water motor is connected with the stirring water tank, the stirring water flowmeter is located at a discharge outlet of the stirring water tank and is electrically connected with the central processor; and the foaming agent motor, the pulp water motor and the stirring water motor are all electrically connected with the central processor, the foaming agent tank, the pulp water tank and the stirring water tank all communicate with the mixer; wherein the dry material adding device comprises a gypsum powder tank, a gypsum powder motor, a belt scale, a mixing device, a mixing reamer, a starch tank and a starch motor; wherein the gypsum powder motor, the belt scale, the mixing reamer and the starch motor are all electrically connected with the central processor; the gypsum powder motor is connected with the gypsum powder tank, the starch motor is connected with the starch tank; the gypsum powder tank communicates with the mixing device through the belt scale, the starch tank communicates with the mixing device, the mixing device communicates with the mixer, and the mixing reamer is located inside the mixing device; wherein the forming device comprises a forming station, an infrared detector, a forming plate, a forming belt, a forming belt motor and a paper guide roller, the mixer communicates with the forming station, the infrared detector is arranged above the forming station, the forming belt is arranged in parallel with the forming station, the paper guide roller is located above the forming belt, and the infrared detector, the forming belt motor and the paper guide roller are all electrically connected with the central processor; the control method of the gypsum board forming system comprises the following acts: 1) when receiving a power-on signal, transmitting, by the operation screen, the power-on signal to the central processor; 2) controlling, by the central processor, the mix and the infrared detector to start, and controlling the forming belt motor to run at a preset initial rotating speed; 3) controlling, by the central processor, the wet material adding device and the dry material adding device to start in sequence; 4) controlling, by the central processor, the mixer to open a discharge outlet; when the mixer opens the discharge outlet for a first preset time length, controlling, by the central processor, the forming plate to reach a working position; and when the forming plate remains at the working position for a second preset time length, controlling, by the central processor, the paper guide roller to reach a working position; 5) when the infrared detector detects that a thickness of gypsum slurry on the forming station reaches a preset thickness threshold, sending, by the infrared detector, a notification signal to the central processor; upon the central processor receives the notification signal, controlling, by the central processor, a rotating speed of the forming belt motor to increase uniformly from the preset initial rotating speed to a preset production rotating speed; wherein the first preset time length is 8 to 12 seconds, the second preset time length is 5 to 8 seconds, a moving speed of the belt corresponding to the preset initial rotating speed is 15 to 25 meters per minute. 1) when receiving a power-on signal, transmitting, by the operation screen, the power-on signal to the central processor; 2) controlling, by the central processor, the mix and the infrared detector to start, and controlling the forming belt motor to run at a preset initial rotating speed; 3) controlling, by the central processor, the wet material adding device and the dry material adding device to start in sequence; 4) controlling, by the central processor, the mixer to open a discharge outlet; when the mixer opens the discharge outlet for a first preset time length, controlling, by the central processor, the forming plate to reach a working position; and when the forming plate remains at the working position for a second preset time length, controlling, by the central processor, the paper guide roller to reach a working position; 5) when the infrared detector detects that a thickness of gypsum slurry on the forming station reaches a preset thickness threshold, sending, by the infrared detector, a notification signal to the central processor; upon the central processor receives the notification signal, controlling, by the central processor, a rotating speed of the forming belt motor to increase uniformly from the preset initial rotating speed to a preset production rotating speed;