Applicator easy to pierce and capable of adjusting high flow speed

The utility model belongs to the field of medical instruments, and particularly relates to an easy-to-pierce and high-flow-speed-adjustable applicator which comprises a liquid storage tube, an opening is formed in one side of the liquid storage tube, a sealing layer is arranged at the opening, the liquid storage tube is connected with a connecting base, and the connecting base is connected with a brush head. An assembly marking line, a puncture marking line and a positioning marking line are arranged at the end, close to the sealing layer, of the outer pipe wall of the liquid storage pipe, the positioning marking line is distributed on the pipe wall in the axis direction, the assembly marking line and the puncture marking line are distributed on the pipe wall in the direction perpendicular to the axis, and a first groove and a second groove which are communicated and concave inwards are formed in the two ends of the connecting base respectively. The first groove is connected with the brush head, the second gr