An ultrasound needle positioning system includes an ultrasound probe and a processor. The ultrasound probe is used for capturing a plurality of sets of needle images. Each set of needle images includes a plurality of needle images corresponding to a predefined angle of insertion of a needle. The processor is coupled to the ultrasound probe for training a first convolutional neural network according to at least one set of needle images of the plurality of sets of needle images, so as to generate needle position information after the needle is inserted. The needle position information includes a reference location, a length, and/or a width corresponding to at least one predefined angle of insertion of the needle being inserted.超音波探針定位系統包括超音波探頭及處理器。超音波探頭用以採集複數組入針影像幀。每組入針影像幀包括對應針體於預定入針角度的複數個入針影像幀。處理器耦接超音波探頭，用以依據複數組入針影像幀中至少組入針影像幀訓練第一卷積神經網路，以產生針體入針後的針體定位訊息。針體定位訊息包括對應至少預定入針角度之針體的參考位置、長度及/或寬度。
