The embodiment of the invention discloses a calculation method and apparatus for temperature of a high-voltage switch contact covered with an insulation layer. A second insulation layer temperature distribution function formula with a correction factor introduced is built; real-time temperature of a switch cabinet breaker and measured by a temperature sensor is acquired; and the temperature of a solid insulation switch cabinet contact is calculated according to the real-time temperature of the switch cabinet breaker and preset parameters. The calculation method and apparatus solve a technical problem that the temperature of a switch contact in the solid insulation switch cabinet tightly covered with the insulation layer cannot be directly measured via the preset switch cabinet solid insulation switch cabinet contact temperature detection technology.