A parallel connection slot includes a parallel connection groove main body lower cover and a parallel connection groove main body upper cover, A low cover of that parallel connection groove main bodyand an upper cover of the parallel connection groove main body are integrally connected by bolts, A torsion cap is arranged on the bolt, A low cover of that parallel connection groove main body and anupper cover of the parallel connection groove main body can be clamped or loosened by rotating the torque cap. On the opposite side of the lower cov of the parallel connection groove main body and the upper cover of the parallel connection groove main body, two arc-shaped insulating copper tooth sheaths are respectively arranged on the left and right sides of the parallel connection groove main body to form two mutually parallel connection grooves, and copper teeth are arranged on the outside of the copper tooth sheath. The utility model has the advantages of reliable firmness and sealing, not easy electric leakage, strong breakdown resistance, simple structure, durability, firmness and reliability, and greatly prolongs the service life of the puncture parallel wiring groove.