Multi-layer parallel 3D printing device and printing method

The invention provides a multi-layer parallel 3D printing device which comprises a translation assembly and a laser assembly and further comprises a scraper assembly, an air path system and a lifting system. The air path system comprises at least two sets of smoke blowing assemblies, and each set of smoke blowing assembly is used for absorbing smoke generated by the corresponding laser machining area. The multiple sets of scraper assemblies are arranged, and each laser machining area is located on the moving track of one scraper assembly. The lifting system is used for independently adjusting the height of each scraper assembly relative to the printing surface; the laser assembly comprises at least two groups of light emitting heads, the light emitting heads are in one-to-one correspondence with the smoke blowing assemblies, and each light emitting head faces the laser processing area of the corresponding smoke blowing assembly; the translation assembly is used for driving the smoke blowing assembly, the scra