The invention discloses a ground-connection bed sheet. The bed sheet includes a body, connection lines and a resistance adjustable device. The body includes imported conductive fiber forming a reticular conductive system, the resistance adjustable device includes an adjustable resistor which is connected through one connection line, and the body, the human body and the ground form an electric loopthrough the connection line. When a person sleeps on the bed sheet, positive and negative charges inside and outside human cells reach a balanced state, the intrinsic bioelectric state is optimized,and various physiological indexes of the human body are improved. The bed sheet can relieve or eliminate bad symptoms caused by many kinds of inflammation, reduce or eliminate chronic pain, improve the quality of sleep, make people energetic, relieve the nervous system, reduce the secretion of stress hormones, reduce stress, promote calming of the body and the mind, dilute the blood, improve the blood pressure, promote flowing of the blood, relieve muscle tension and headache, reduce endocrine disorders and menstrual symptoms, normalize the physiological cycle of people, and prevent bedsore.