The invention discloses a connector of a light-emitting diode(LED) lamp strip. The connector comprises a right-angled-U-shaped groove seat and an inverted-U-shaped groove cover, wherein the groove cover is inserted into the groove seat, upper support lugs are formed on the side walls of the front end of the groove cover, semicircular lower support lugs are formed on the side walls of the front endof the groove seat, and horizontal stop bars are formed at the positions, on the lower sides of the lower support lugs, of the inner side walls of the groove seat; an inverted-U-shaped sliding seat is inserted into the groove seat, guide bars are formed on the two sides of the lower end of the sliding seat, and the guide bars are inserted between the stop bars and the bottom surface of the innerside of the groove seat; and a rack is formed on the bottom surface of the inner side of the sliding seat, horizontal guide grooves are formed in the position, on the lower side of the rack, of the side wall of the sliding seat, a gear shaft is engaged on the rack, two ends of the gear shaft penetrate through the guide grooves of the sliding seat and are fixedly connected to the upper support lugsof the groove cover in an inserted mode, support shafts are formed at two ends of the gear shaft, and the support shafts penetrate through the upper support lugs and are arranged on the lower supportlugs of the groove seat in an inserted mode. According to the connector, connecting poles on the lamp strip can be conveniently inserted and fixed, the connecting poles can be prevented from loosening, and the poor contact condition can be avoided.