A pot cover assembly, comprising: a pot cover body; and a spill-proof detection device, the spill-proof detection device being a capacitive detection device and being disposed to the pot cover body, at least a lower surface of the spill-proof detection device forming a detection surface, and a capacitance value of the spill-proof detection device changing with change of a contact state between a medium and the detection surface, wherein the spill-proof detection device comprises: an electric conductor; an insulator, the insulator covering at least a side surface and/or a lower surface of the electric conductor; a capacitance detection chip, the capacitance detection chip being connected with the electric conductor and generating a detection signal by detecting a variation of the capacitance value of the electric conductor; characterized in that the electric conductor comprises: a first electric conduction part; a second electric conduction part, the second electric conduction part being disposed above the first electric conduction part, the second electric conduction part and the first electric conduction part being formed in one piece, a diameter of the second electric conduction part being larger than a diameter of the first electric conduction part, the insulator comprising at least a first insulation wall covering a lower surface of the first electric conduction part and a second insulation wall covering a lower surface of the second electric conduction part, the detection surface comprising a first detection surface formed by a lower surface of the first insulation wall and a second detection surface formed by a lower surface of the second insulation wall, and the capacitance value of the electric conductor changing with change of contact states between the medium and the first detection surface as well as the second detection surface. a pot cover body; and a spill-proof detection device, the spill-proof detection device being a capacitive detection device and being disposed to the pot cover body, at least a lower surface of the spill-proof detection device forming a detection surface, and a capacitance value of the spill-proof detection device changing with change of a contact state between a medium and the detection surface, wherein the spill-proof detection device comprises: an electric conductor; an insulator, the insulator covering at least a side surface and/or a lower surface of the electric conductor; an electric conductor; an insulator, the insulator covering at least a side surface and/or a lower surface of the electric conductor; a capacitance detection chip, the capacitance detection chip being connected with the electric conductor and generating a detection signal by detecting a variation of the capacitance value of the electric conductor; characterized in that the electric conductor comprises: a first electric conduction part; a second electric conduction part, the second electric conduction part being disposed above the first electric conduction part, the second electric conduction part and the first electric conduction part being formed in one piece, a diameter of the second electric conduction part being larger than a diameter of the first electric conduction part, the insulator comprising at least a first insulation wall covering a lower surface of the first electric conduction part and a second insulation wall covering a lower surface of the second electric conduction part, the detection surface comprising a first detection surface formed by a lower surface of the first insulation wall and a second detection surface formed by a lower surface of the second insulation wall, and the capacitance value of the electric conductor changing with change of contact states between the medium and the first detection surface as well as the second detection surface. a first electric conduction part; a second electric conduction part, the second electric conduction part being disposed above the first electric conduction part, the second electric conduction part and the first electric conduction part being formed in one piece, a diameter of the second electric conduction part being larger than a diameter of the first electric conduction part, the insulator comprising at least a first insulation wall covering a lower surface of the first electric conduction part and a second insulation wall covering a lower surface of the second electric conduction part, the detection surface comprising a first detection surface formed by a lower surface of the first insulation wall and a second detection surface formed by a lower surface of the second insulation wall, and the capacitance value of the electric conductor changing with change of contact states between the medium and the first detection surface as well as the second detection surface.