The invention provides a detecting and feeding mechanism of belt electronic components, which has high detection efficiency, convenient adjustment and reliable performance and feeds an electronic component while detecting the electronic component. The detecting and feeding mechanism comprises a feeding bracket plate with a feeding groove, a left feeding rack, a right feeding rack, a pair of detection probes and a feeding power mechanism, wherein electronic component belts are arranged at the upper part of the feeding bracket plate; two pins of each electronic component are arranged at the lower parts of opposite tooth space grooves on the two feeding racks; the detection pins are respectively arranged at the roots of the opposite tooth space grooves on the two feeding racks; the feeding power mechanism drives the left feeding rack and the right feeding rack to realize reciprocating motion: the left feeding rack and the right feeding rack move downwards from start positions so that thetwo pins of the electronic component enter the roots of the opposite tooth space grooves on the two feeding racks; the left feeding rack and the right feeding rack move backwards; then, the left feeding rack and the right feeding rack move upwards until the two pins of the electronic component leave the opposite tooth space grooves; and finally, the left feeding rack and the right feeding rack move forwards and return to the start positions.