An intelligent mouth opening rehabilitation device, comprising: a body, wherein an end of the body is provided with an upper bite pad and a lower bite pad; a pressure sensor, provided in the upper bite pad and/or the lower bite pad, for detecting pressure data on the upper bite pad and/or the lower bite pad; a stepping motor, for driving the upper bite pad and/or the lower bite pad to swing longitudinally; and a processor, for controlling the stepping motor to operate or stop according to the pressure data and/or a preset training instruction, thereby driving the upper bite pad and/or the lower bite pad to swing longitudinally or to stop; wherein the processor for controlling the stepping motor to operate or stop according to the pressure data is configured to compare the pressure data with a preset pressure threshold in real time; if the pressure data are lower than the preset pressure threshold, the processor controls the stepping motor to operate forward, to enable the upper bite pad to swing up a distance and/or the lower bite pad to swing down a distance, then returns to the first operation; and if the pressure data reach the preset pressure threshold, the processor controls the stepping motor to stop operating, to enable the upper bite pad and/or the lower bite pad to stop swinging; wherein the preset pressure threshold is set by testing a patient's pain performance in combination with a physician's observations when the physician instructs the patient on the use of the mouth opening rehabilitation device in an early stage; wherein the processor for controlling the stepping motor to operate or stop according to the pressure data further includes an operation wherein the pressure sensor detects the pressure data in real time to determine whether the pressure data reach a second pressure threshold; wherein the second pressure threshold is greater than the preset pressure, so that the patient increases a pressure exerted on the upper bite pad and the lower bite pad through upper and lower jaws of a mouth of the patient to reduce an opening angle between the upper bite pad and the lower bite pad, when the patient wants to interrupt a mouth opening training or when the patient wants to reduce the opening angle due to increasing soreness of the oral-jaw muscles; wherein if the pressure data reach the second pressure threshold, the processor controls the stepping motor to operate reversely, thereby enabling the upper bite pad to swing down a distance and/or the lower bite pad to swing up a distance, then returns to the first operation. a body, wherein an end of the body is provided with an upper bite pad and a lower bite pad; a pressure sensor, provided in the upper bite pad and/or the lower bite pad, for detecting pressure data on the upper bite pad and/or the lower bite pad; a stepping motor, for driving the upper bite pad and/or the lower bite pad to swing longitudinally; and a processor, for controlling the stepping motor to operate or stop according to the pressure data and/or a preset training instruction, thereby driving the upper bite pad and/or the lower bite pad to swing longitudinally or to stop; wherein the processor for controlling the stepping motor to operate or stop according to the pressure data is configured to compare the pressure data with a preset pressure threshold in real time; if the pressure data are lower than the preset pressure threshold, the processor controls the stepping motor to operate forward, to enable the upper bite pad to swing up a distance and/or the lower bite pad to swing down a distance, then returns to the first operation; and if the pressure data reach the preset pressure threshold, the processor controls the stepping motor to stop operating, to enable the upper bite pad and/or the lower bite pad to stop swinging; wherein the preset pressure threshold is set by testing a patient's pain performance in combination with a physician's observations when the physician instructs the patient on the use of the mouth opening rehabilitation device in an early stage; wherein the processor for controlling the stepping motor to operate or stop according to the pressure data further includes an operation wherein the pressure sensor detects the pressure data in real time to determine whether the pressure data reach a second pressure threshold; wherein the second pressure threshold is greater than the preset pressure, so that the patient increases a pressure exerted on the upper bite pad and the lower bite pad through upper and lower jaws of a mouth of the patient to reduce an opening angle between the upper bite pad and the lower bite pad, when the patient wants to interrupt a mouth opening training or when the patient wants to reduce the opening angle due to increasing soreness of the oral-jaw muscles; wherein if the pressure data reach the second pressure threshold, the processor controls the stepping motor to operate reversely, thereby enabling the upper bite pad to swing down a distance and/or the lower bite pad to swing up a distance, then returns to the first operation.