A solar energy conduction oil heating system comprises a solar energy conduction oil heater and heat using equipment which are connected through an oil outlet pipe and an oil returning pipe. A circulating pump is arranged on the oil returning pipe. The solar energy conduction oil heating system further comprises a capsule expansion groove, wherein the capsule expansion groove comprises a sealed outer capsule body, an inner capsule body is arranged inside the outer capsule body, the lower end of the inner capsule body is communicated with the oil returning pipe, an air exhaust valve which is located outside the outer capsule body is arranged at the upper end of the inner capsule body, and the outer capsule body is provided with an air filling valve. The solar energy conduction oil heating system has the advantages of being easy to install and convenient to maintain, a conduction oil system can be isolated with atmosphere, and the high-temperature conduction oil is prevented from being oxidized.