The invention provides an improved compact CMOS (Complementary Metal-Oxide-Semiconductor Transistor) voltage stabilizing circuit. The improved compact CMOS voltage stabilizing circuit comprises a first N-type MOS (Metal Oxide Semiconductor) transistor MN0, a second N-type MOS transistor MN1, a third N-type MOS transistor MN3, a fourth N-type MOS transistor MN4, a fifth N-type MOS transistor MN5, a first P-type MOS transistor MP0 and a second P-type MOS transistor MP1. The circuit only comprises the MOS transistors, and has the characteristics of low power consumption and small area; compared with a general filtering stabilizing circuit based on an on-chip capacitor, the improved compact CMOS voltage stabilizing circuit has higher practicability and achieves the effect of stabilizing voltage by increasing the power supply rejection ratio of the circuit.