Puncture-proof device for blood bag

The invention is applicable to the technical field of medical equipment. The invention provides a puncture-proof device for a blood bag. The puncture-proof device comprises a blood bag, a fixed seat,a pushing plate and a fixed column, a hard mesh bag is arranged in the blood bag; the fixed seat is fixed at the bottom of the blood bag; a first sealing layer is arranged at the joint of the fixed seat and the blood bag; the side wall of the fixed seat is connected with a medicine conveying pipe; the pushing plate is slidably connected with the fixed seat; a needle head of a needle tube penetrates through a needle tube hole to enter a fixed cavity and pierce a second sealing layer; the needle tube is fixed in the fixed cavity; then the pushing plate is applied with force to enable the pushingplate and the fixed seat to slide relatively, until the pushing plate is attached to the fixed seat; the needle tube pierces the first sealing layer and enters an extension hard tube, so that the problem of puncturing of the