The application relates to a trocar with dual-protection shield comprises an obturator and a cannula, said cannula including a hollow sleeve, which includes a sleeve distal-end and a sleeve-lip, said obturator including a handle, the distal-end portion, and a shaft therebetween. When the trocar is in operation, the obturator penetrates through the cannula into the body wall to establish a penetration channel. The shaft includes a fastened shaft and a movable shaft； the fastened protection shield comprises a base of the fastened shield and a slant distal-end of the fastened shield connected thereto, the slant distal-end including a distal shaft-aperture, which penetrates the slant distal-end to form a fastened-shield-lip； the fastened protection shield is connected with the fastened shaft, the working-blade extending toward the proximal end and connected with a fastened shaft or handle, the working-blade extending toward the distal end beyond the fastened-shield-lip.
