The invention discloses an injection-and-production-separated oil well heat-injecting oil production process, which includes the following steps: (1) an insert seal is adopted to divide the part of an injection and production string corresponding to an oil layer into a bottom heat injection section and an upper oil production section; (2) the bottom heat injection section and a lower sand pipe on a sand control string corresponding to the bottom heat injection section are utilized to inject a hot medium to the lower part of the oil layer; (3) the upper oil production section and an upper sand pipe on the sand control string corresponding to the upper oil production section are utilized to produce crude oil. The invention also discloses two types of units for carrying out the injection-and-production-separated oil well heat-injecting oil production process. Since the invention produces oil from the upper part of the oil layer and injects heat to the lower part of the oil layer, the impact of the injected hot medium on the oil production layer is prevented, the amount of sand carried by produced oil is reduced, consequently, the impact of the produced oil on the sand control screen is decreased, the probability of the damage of the sand control screen is decreased, the oil production efficiency is increased, and the oil production period is prolonged.