The present disclosure relates to a novel high-low temperature radiator for internal combustion engine engineering machinery, which is provided with a water inlet pipe, a water inlet chamber, a radiator core body, a water outlet chamber, a water separation plate and a water outlet pipe which are sequentially communicated, the water inlet pipe is communicated with the water inlet chamber, and the water inlet chamber is communicated with the radiator core body; the radiator core body is divided into two parts: a radiator low-temperature core body and a radiator high-temperature core body; the water outlet chamber is divided into two parts: a low-temperature water outlet chamber and a high-temperature water outlet chamber, and the water outlet pipe is divided into a low-temperature water outlet pipe and a high-temperature water outlet pipe according to the core body and the water chamber from which the cooling liquid flows.