The invention discloses a solid medical ultrasound coupling patch and a preparing method thereof. The solid medical ultrasound coupling patch is prepared from a sodium alginate polymer, carrageenan, xanthan gum, hydroxymethyl cellulose, propylene glycol, glycerol, a preservative and deionized water. The preparing method comprises the steps that the sodium alginate polymer, glycerol, pure water andthe like are taken according to the mass ratio, mixed, heated and stirred evenly, and the mixture is discharged after heat-preservation defoaming is carried out, and then forms products of various specifications and shapes through filling. The solid medical ultrasound coupling patch is convenient to use and has excellent sound conduction and isolation effects; when medical personnel are in contact with infectious patients, the functions of preventing the risk of cross infection in a hospital and protecting the medical personnel are achieved after separation. The solid medical ultrasound coupling patch serves as a coupling medium, is specially applied to black and white ultrasonic equipment, color Doppler ultrasound equipment and the fields of ultrasound focusing and ultrasound treatment,and is suitable for the superficial surface, soft tissue, muscle bones, milk glands and thyroid glands of the human body and other parts where a liquid gel medium is difficult to use in ultrasound application.