Microneedle array

The microneedle array comprises a main body and a connector detachably connected to the lower portion of the main body, the connector comprises a moving seat capable of moving up and down in the connector, a plurality of microneedles are arranged below the moving seat, and a moving assembly capable of moving up and down is arranged in the main body. An ultrasonic probe used for detecting the thickness of the corium layer and the thickness of the epidermal layer is arranged on the bottom face of the connector, and when the connector is connected to the lower portion of the body, the moving assembly can drive the moving base and the microneedle to move downwards by the corresponding distance according to the thickness measured by the ultrasonic probe. The length of the punctured microneedle can be adjusted in real time according to the thickness of the punctured skin, subcutaneous injection is achieved, meanwhile, the puncturing process of the microneedle is more comfortable, and the pain feeling of a user is r