The invention discloses a capacitor voltage-dividing compensation type power supply, belonging to a series of high-frequency single-conversion power supplies, the output of the capacitor voltage-dividing compensation type power supply has the same frequency as and shares a neutral line [NEUTRAL]N with the mains supply input. The capacitor voltage-dividing compensation type power supply has the functions of output voltage stabilization, small range voltage regulation and input power factor correction. When the input voltage of the compensated power supply is higher than the rated value of the load voltage, the problem of ''excess energy'' returning to the power supply is solved successfully. The compensation voltage amplitude is usually less than 100V, so the MOS transistor with low voltageand high current internal resistance of m ohm can be used to save energy and low cost, and the MOS transistor can be directly connected in parallel to enlarge the output power. Bootstrap boost rectifier is only used to supplement the 'insufficient energy' when the mains input voltage is lower than the rated load voltage, and the whole current is very small. The essential difference from the comparison document ''A compensated power supply'' [201510051636.3] is that the capacitor voltage-dividing circuit replaces the autotransformer, which greatly reduces the energy consumption, cost, volume and weight.