Pharmaceutical preparation for assisting in promoting sleep and preparation method thereof

A preparation method of a pharmaceutical preparation, comprising:

• dividing water into four parts, adding a first part of the four parts of the water into nano-titanium dioxide and stirring evenly to obtain a first mixture, wherein a weight of the first part of the water is 10-20 times of a weight of the nano-titanium dioxide;
• adding a second part of the four parts of the water into the first mixture by rinsing a stirring rod with the second part of the water, then adding melatonin into the first mixture and stirring evenly to obtain a second mixture;
• wherein a weight of the second part of the water is 10-20 times of a weight of the melatonin;
• adding a third part of the four parts of the water into the second mixture by rinsing the stirring rod with the third part of the water, then adding sodium copper chlorophyllin and tea polyphenol into the second mixture, and stirring evenly to obtain a third mixture;
• wherein a weight of the third part of the water is equal to a weight of the sodium copper chlorophyllin;
• and
• adding a forth part of the four parts the water into the third mixture by rinsing the stirring rod with the forth part of the water to obtain a target mixture, and placing the target mixture into a ultrasonic oscillator to obtain the pharmaceutical preparation.