Linear voltage-stabilized power supply

The invention discloses a linear voltage-stabilized power supply, and the power supply comprises an input unit which is used for suppressing the electromagnetic noise of an alternating current inputted by a power grid and a clutter signal with a specific frequency; a transformer which is electrically connected to the input unit and is used for carrying out isolation voltage reduction on the alternating current; a rectifying and filtering unit which is electrically connected to the transformer and is used for rectifying and filtering the alternating current after isolation and voltage reduction so as to output direct current positive voltage and direct current negative voltage; and an output unit which is electrically connected to the rectifying and filtering unit and is used for outputting positive voltage and negative voltage which can be dynamically adjusted according to the direct current positive voltage and the direct current negative voltage, wherein the output voltage ripple is relatively low, the stru