Novel separable piezoelectric medical infusion pump

The invention relates to a medical infusion device, and belongs to the field of medical infusion. A piezoelectric driving part is composed of a liquid storage cavity, a circular-ring top cover, a liquid storage ring, a flexible soft film, a sealing ring and a piezoelectric vibrator, and an infusion part is composed of a shrinking opening, a pump cavity, a diffusion opening and a flexible soft film; the upper piezoelectric driving part and the lower infusion part are separable, the infusion part can be replaced after using, and the piezoelectric driving part is recycled. According to the medical infusion device, a traditional piezoelectric infusion pump is divided into the piezoelectric driving part and the infusion part which are separable, that is to say, the piezoelectric vibrator is notin direct contact with liquid, the piezoelectric driving part can be recycled accordingly, the service life of the infusion pump is prolonged, the cost of medical apparatuses and instruments is wellreduced, and environment p