The invention relates to a hydraulic torque converter for a fork truck. The hydraulic torque converter comprises a cover wheel assembly, a turbine assembly, a pump impeller assembly and a guide wheel assembly, wherein the cover wheel assembly comprises a cover wheel hub and a cover wheel shell; the turbine assembly comprises a turbine hub and a turbine body; the pump impeller assembly comprises a pump impeller hub and a pump impeller body; the guide wheel assembly comprises a front retaining ring, a rear retaining ring and a guide wheel body; a three-coating-sheet bearing, an anti-thrust sheet and a ball bearing are arranged between the cover wheel hub and the turbine hub, between the turbine hub and the front retaining ring as well as between the rear retaining ring and the pump impeller hub; the bearing between the cover wheel hub and the turbine hub is a three-coating-sheet bearing; a three-coating-sheet bearing is arranged between the rear retaining ring and the pump impeller hub; and a three-coating-sheet bearing is arranged between the rear retaining ring and the ball bearing. According to the invention, the technical problems of unreasonable inside positioning, severe wearing, and noise generation of the traditional hydraulic torque converter for the fork truck are solved; and the hydraulic torque converter provided by the invention has low oil consumption, low noise and large torque.