The invention relates to the field of pipeline connectors and discloses a theft-proof plug-in type slotted head steel pipe connector capable of realizing mechanical pavement. The theft-proof plug-in type slotted head steel pipe connector comprises a ring-shaped connector body, sealing rubber rings, an elastic supporting body, a locking spring and a snap ring which is arranged in a groove of a slotted head of a slotted heat steel pipe, wherein two outer end grooves and two inner end grooves are formed in the inner wall of the connector body; the sealing rubber rings are arranged inside the inner end grooves; the elastic supporting body and the locking spring are arranged inside the outer end grooves; the elastic supporting body is positioned between the outer end grooves and the locking spring. When being used for on-site connection of slotted head steel pipes, the connector disclosed by the invention is simple to operate, high in speed and capable of realizing automatic mechanical pavement of pipelines. After being connected, the pipelines are hard to dismount by adopting a general tool and good security is realized. A joint is reasonable in overall stress and high safety is realized. The theft-proof plug-in type slotted head steel pipe connector is low in processing cost and production cost, quite good in economical efficiency and quite high in performance to cost ratio.