The invention discloses a balloon catheter for drug injection. The balloon catheter comprises a catheter body and a balloon component. The catheter body comprises an inner tube, a middle tube and an outer tube which are sequentially arranged from the inside to outside, a guide wire channel for allowing guide wires to enter is formed in the radial inner side of the inner tube, a balloon expansion channel is formed in the radial inner side of the middle tube, and a drug channel is formed between the middle tube and the outer tube radially. The balloon component comprises a balloon body, the second end of the balloon body is closed by a tip, the inner tube extends into the balloon body to be fixed by the tip, the middle tube is connected with the first end of the balloon body, and the outer tube is fixed to the outer side wall of the first end of the balloon body. A plurality of drug injection tubes communicated with the drug channel are arranged on the outer side wall of the balloon body, and are parallel to the radial direction of the balloon body, and a plurality of drug injection micropores are equidistantly arrayed on each drug injection tube along a straight line.