A stereolithography 3D printer, comprising: a material tank configured to store print materials; a light module configured to transmit beams to the material tank; a temperature-adjusting module configured for temperature-adjusting; a temperature-sensing module configured to sense a sensed temperature; a curing platform configured to carry a 3D physical model; a memory module configured to store print data and a default value for the sensed temperature; and a control module electrically connected to the light module, the temperature-adjusting module, the temperature-sensing module and the memory module, wherein the control module is configured to execute a procedure of controlling temperature to control the temperature-adjusting module to adjust a temperature of the print materials when the sensed temperature doesn't reach the default value, and to execute a procedure of 3D printing according to the print data to control the light module to irradiate the print materials whose temperature had been adjusted for manufacturing the 3D physical model; the stereolithography 3D printer is a bottom-up light source stereolithography 3D printer. characterized in that: the stereolithography 3D printer further comprises a driving module electrically connected to the control module and connected to the curing platform; wherein the temperature-adjusting module comprises a forced convection apparatus and an arrangement position of the forced convection apparatus is higher than an arrangement position of the material tank; the control module is configured to control the driving module to move the curing platform to a waiting position for making the curing platform be located above the material tank and between the temperature-adjusting module and the material tank and making a distance between the curing platform and the material tank be a default distance; and wherein the control module is configured to execute the procedure of 3D printing when the sensed temperature reaches the default value. a material tank configured to store print materials; a light module configured to transmit beams to the material tank; a temperature-adjusting module configured for temperature-adjusting; a temperature-sensing module configured to sense a sensed temperature; a curing platform configured to carry a 3D physical model; a memory module configured to store print data and a default value for the sensed temperature; and a control module electrically connected to the light module, the temperature-adjusting module, the temperature-sensing module and the memory module, wherein the control module is configured to execute a procedure of controlling temperature to control the temperature-adjusting module to adjust a temperature of the print materials when the sensed temperature doesn't reach the default value, and to execute a procedure of 3D printing according to the print data to control the light module to irradiate the print materials whose temperature had been adjusted for manufacturing the 3D physical model; the stereolithography 3D printer is a bottom-up light source stereolithography 3D printer. characterized in that: the stereolithography 3D printer further comprises a driving module electrically connected to the control module and connected to the curing platform; wherein the temperature-adjusting module comprises a forced convection apparatus and an arrangement position of the forced convection apparatus is higher than an arrangement position of the material tank; the control module is configured to control the driving module to move the curing platform to a waiting position for making the curing platform be located above the material tank and between the temperature-adjusting module and the material tank and making a distance between the curing platform and the material tank be a default distance; and wherein the control module is configured to execute the procedure of 3D printing when the sensed temperature reaches the default value. the stereolithography 3D printer further comprises a driving module electrically connected to the control module and connected to the curing platform; wherein the temperature-adjusting module comprises a forced convection apparatus and an arrangement position of the forced convection apparatus is higher than an arrangement position of the material tank; the control module is configured to control the driving module to move the curing platform to a waiting position for making the curing platform be located above the material tank and between the temperature-adjusting module and the material tank and making a distance between the curing platform and the material tank be a default distance; and wherein the control module is configured to execute the procedure of 3D printing when the sensed temperature reaches the default value.