The invention discloses a mobile terminal and a printed circuit board PCB thereof. The printed circuit board PCB comprises a body, a power supply management integration circuit PMIC system main chip, a filtering component and a ground plane structure, wherein the body includes component layers and a signal layer; the power supply management integration circuit PMIC system main chip is arranged above any one of the two component layers; the filtering component is used for receiving a current emitted by the PMIC system main chip and carrying out filtering processing on the current; the PMIC system main chip includes a first bonding pad, the filtering component includes a second bonding pad; the ground plane structure is arranged above the signal layer which is adjacent to any one component layer; the ground plane structure includes a third bonding pad; the third bonding pad is connected to the first bonding pad and the second bonding pad; and after the filtering processing, the current flows to the PMIC system main chip successively through the second bonding pad, the third bonding pad and the first bonding pad. By using the printed circuit board PCB, during carrying out filtering on the current, a current loop is effectively shortened so as to reduce an impedance in the current loop and then reduce current losses.