The invention discloses a voltage detection circuit. A circuit constituted by a resistor R206, a resistor R207, an NMOS transistor MN201, an NMOS transistor MN202 and an NMOS transistor MN203 in the circuit generates a bias current related to the input voltage VIN; a PMOS transistor MP201, a PMOS transistor MP202 and a PMOS transistor MP203 constitute a current mirror; a current of the PMOS transistor MP202 flows into a first node, and a current of the PMOS transistor MP203 flows into a second node; the voltage of the first node is divided through the resistor R201 and a resistor R204 to obtain the voltage of a third node, and the voltage of the second node is divided through a resistor R203 and a resistor R205 to obtain the voltage of a fourth node; and the positive input end of a comparer is connected with the fourth node, and the negative input end of the comparer is connected with the third node. The voltage detection circuit has the characteristics of being simple in structure, low in working voltage, low in power consumption and small in chip occupied area.