The invention discloses a sliding sleeve colliding pin type injection tool and a drainage method, and belongs to the field of oilfield equipment. The tool comprises a short section, trepanning pins and sliding sleeves, wherein the top end of the short section is connected with a first oil pipe section, the bottom end of the short section is connected with a second oil pipe section, and sedimentalwater is located in the first oil pipe section; each trepanning pin comprises a blocking section and a trepanning section which are connected together, the plugging sections are located in the short section, the trepanning sections are located in the side wall of the short section, through holes are formed in the trepanning sections in the axial direction, one ends of the through holes are blockedby the blocking sections, and the other ends of the through holes communicate with an oil sleeve annular space; and the sliding sleeves are arranged in the short section in a sleeving mode, and the bottom ends of the sliding sleeves make contact with the blocking sections to be used for applying force to shear off the blocking sections, so that one ends of the through holes communicate with the short section. According to the sliding sleeve colliding pin type injection tool, the blocking sections are sheared off through the force application of the sliding sleeves, the through holes in the trepanning sections communicate with the oil sleeve annular space and the short section, gas or foam scrubbing agents in the oil sleeve annular space can enter an oil pipe through the through holes fordrainage, the operation is simple and convenient, the labor intensity is reduced, and the risk of damage to a sleeve pipe does not exist.