The invention discloses a hybrid heat-release and blockage-relieving method for a carbonate-cemented sandstone heavy oil well. The method comprises the following steps that firstly, a shaft is heated,so that the viscosity of the heavy oil in the shaft and near the shaft is reduced; secondly, a prepad fluid is injected into the shaft, and then a main fluid is added; thirdly, a subsequent fluid isinjected, and then a displacement fluid is injected; fourthly, raffinate flows back, wherein flowback is conducted at a low speed, and the acidification time is 16 hours or above; fifthly, oil is pumped and extracted by using an electric heating rod pump. By means of the method, the problem that an existing conventional acidification method is not suitable for acidification of a heavy oil layer issolved, a hybrid heat-release technology is adopted, while the rheological property of crude oil is improved, an oil film on the surface of carbonate cement is stripped, the contact area of the carbonate cement and the acidizing fluid is increased, the acid-rock reaction temperature is increased through chemical heat release, the exsolution effect of the adopted main acidizing fluid on the carbonate cement is given full play to, the success rate of the measure and the acidification valid period are improved, and therefore, the recovery efficiency of high-permeability heavy oil reservoirs, therecovery efficiency of middle-permeability heavy oil reservoirs and even the recovery efficiency of part of low-permeability heavy oil reservoirs can be improved.