A tubular thick film heater protection apparatus, configured to provide protection for a tubular heater assembly (10, 20) and comprising: an upper tube, wherein the upper tube comprises an upper tube side surface; and a base, wherein a middle portion of the base is provided with a circular hole that allows a liquid discharge conduit of the tubular heater assembly to stick out; characterized in that said upper tube of the tubular thick film heater protection apparatus further comprises a toroid wherein said upper tube side surface and said toroid are disposed with an inner space, wherein an outer ring surface of the toroid is integrally connected to an upper portion of the upper tube side surface, and a radius of an inner ring surface of the toroid is less than a radius of an inner side surface of an inner tube of the tubular heater assembly; wherein a flange downwardly extends along the inner ring surface of the toroid, and a space between the flange and an inner side wall of the upper tube side surface forms an upper groove that is suitable to accommodate an upper portion of the tubular heater assembly; and a lower portion of the upper tube side surface is provided with a first locking mechanism; the base is further provided with a lower groove, a radius of an inner side surface of the lower groove is less than the radius of the inner side surface of the inner tube of the tubular heater assembly, and a radius of an outer side surface of the lower groove is greater than a radius of an outer side surface of an outer tube of the tubular heater assembly; the base is provided with an elastic contact piece, and when a lower portion of the tubular heater assembly is mounted on the lower groove, a terminal contact of the elastic contact piece can be connected to an electrode on the outer tube of the tubular heater assembly through contact; a side wall or the bottom of the base is provided with a wiring terminal, the wiring terminal is electrically connected to the elastic contact piece, and the wiring terminal can be externally connected to a power supply; and the base is provided with a second locking mechanism that matches and is locked with the first locking mechanism. an upper tube, wherein the upper tube comprises an upper tube side surface; and a base, wherein a middle portion of the base is provided with a circular hole that allows a liquid discharge conduit of the tubular heater assembly to stick out; characterized in that said upper tube of the tubular thick film heater protection apparatus further comprises a toroid wherein said upper tube side surface and said toroid are disposed with an inner space, wherein an outer ring surface of the toroid is integrally connected to an upper portion of the upper tube side surface, and a radius of an inner ring surface of the toroid is less than a radius of an inner side surface of an inner tube of the tubular heater assembly; wherein a flange downwardly extends along the inner ring surface of the toroid, and a space between the flange and an inner side wall of the upper tube side surface forms an upper groove that is suitable to accommodate an upper portion of the tubular heater assembly; and a lower portion of the upper tube side surface is provided with a first locking mechanism; the base is further provided with a lower groove, a radius of an inner side surface of the lower groove is less than the radius of the inner side surface of the inner tube of the tubular heater assembly, and a radius of an outer side surface of the lower groove is greater than a radius of an outer side surface of an outer tube of the tubular heater assembly; the base is provided with an elastic contact piece, and when a lower portion of the tubular heater assembly is mounted on the lower groove, a terminal contact of the elastic contact piece can be connected to an electrode on the outer tube of the tubular heater assembly through contact; a side wall or the bottom of the base is provided with a wiring terminal, the wiring terminal is electrically connected to the elastic contact piece, and the wiring terminal can be externally connected to a power supply; and the base is provided with a second locking mechanism that matches and is locked with the first locking mechanism.