3D printing device with variable volume high-temperature forming chamber

The invention discloses a 3D printing device with a variable volume high-temperature forming chamber. Rotating shafts at the bottoms of three heating insulation plates and a visual window plate are correspondingly connected to sliding blocks of respective linear guide rail assemblies, and adjacent heating insulation plates and the visual window plate are sequentially connected with corresponding sliding grooves on the side faces of adjacent heating insulation plates or the visual window plate through upper sliding wheels and lower sliding wheels on the side faces; the variable volume high-temperature forming chamber is formed under the conditions that each rotating shaft slides on the sliding block of each linear guide rail assembly and the sliding wheels slide in the sliding grooves; a feeding mechanism and a spraying head assembly are installed on the top face of the forming chamber; a printing platform assembly is installed in the forming chamber; the three heating insulation platesand the printing platfor