A hydrogen-oxygen cycle engine. The hydrogen-oxygen cycle engine comprises a cylinder assembly, a hydrogen supply assembly, an oxygen supply assembly, a cycling medium assembly, an atomized water assembly, a condensate water recovery assembly and a control system. Said engine has the advantages of reasonable structural design, high automation degree, no carbon emission, etc., and can thoroughly solve the problem of environmental pollution. Also provided is a using method for the engine.

A hydrogen-oxygen cycle engine. The hydrogen-oxygen cycle engine comprises a cylinder assembly, a hydrogen supply assembly, an oxygen supply assembly, a cycling medium assembly, an atomized water assembly, a condensate water recovery assembly and a control system. Said engine has the advantages of reasonable structural design, high automation degree, no carbon emission, etc., and can thoroughly solve the problem of environmental pollution. Also provided is a using method for the engine.