A telescopic basket with steplessly-adjustable width includes a basket main body, a fixing part, and a connecting part. The basket main body includes two sets of basket frames and a basket bottom. The two sets of basket frames are arranged opposite to each other. The basket bottom includes two sets of nets. The two sets of nets are telescopically and staggeredly with each other. The two sets of basket frames are telescopically connected to the two sets of nets through the fixing part and the connecting part, respectively.