Solar thermal collector capable of controlling change by capillary force

The invention relates to a solar heat collector with capillary force controlled to change. The solar heat collector comprises a lower part, a first heat collecting part and a second heat collecting part, the reflecting mirror reflects sunlight to the bottom of the lower part of the heat collector; supporting columns extending downwards are arranged on the lower surface of the second plate, lower column bodies extending upwards are arranged on the upper surface of the first plate, the lower column bodies form a lower column body array, the second plate and the first plate form a closed lower part, and capillary driving force is generated between the lower column bodies; the capillary force of the lower column body corresponding to the lower portion of the supporting column is smaller than the capillary force of the lower column body corresponding to the supporting column gap. Through the arrangement, fluid can be uniformly distributed at the bottom of the first plate, so that heat exchange is balanced. 本发明涉及一种