The invention discloses a kind of intelligent waistband monitored automatically by electromagnetic array with adjusting elasticity, including buckle and with body, buckle includes waistline measurement apparatus, slack adjuster and with body fixing device, waistline measurement apparatus, slack adjuster, the hollow housing all with body fixing device with rectangular parallelepiped structure, housing is hinged successively by hinge;Waistline measurement apparatus includes roller, rotary encoder and counter;Slack adjuster includes microcontroller, gyroscope, wireless transmitter, accelerometer, pressure sensor, pressing plate, magnet and the electromagnet array for being separately positioned on inner chamber;One end with body is connected with band body fixing device, and the other end is provided with neck and adjusting button.A kind of intelligent waistband monitored automatically by electromagnetic array with adjusting elasticity of the present invention, its is rational in infrastructure, has the advantages that simple in construction, esy to use, safe and reliable, intelligence degree is high, effectively solves the problem of common waistband is unable to adjust automatically length.