Device and method for detecting damage rate of rock core

The embodiment of the invention provides a rock core damage rate detection device and method. The device comprises a rock core holder, a liquid container, a gas detection component and a processing chip. After the rock core is saturated with the formation water in the liquid container, the first permeability of the rock core in the rock core holder is obtained through the gas logging component; after the rock core is saturated with the fracturing fluid in the fluid container, the second permeability of the rock core is obtained again; and the processing chip calculates the damage rate of the rock core according to the first permeability and the second permeability. In the working process of the detection device for the damage rate of the rock core, the rock core does not need to be moved, the first permeability and the second permeability of the rock core can be directly detected through the gas detection component, and the damage rate of the rock core is calculated according to the first permeability and the