The invention provides a tetrafluoroethylene (TFE) refining method, which comprises the following steps of 1, conveying TFE production pyrolysis gas into a first separation tower to be separated; recovering TFE from tower top gas of the first separation tower; introducing coarse gas of the first separation tower into a rectification tower after the coarse gas of the first separation tower is exhausted from the middle part of the first separation tower; enabling tower kettle liquid of the first separation tower to enter a heavy ingredient recovery system; 2, after the coarse gas of the first separation tower enters the rectification tower to be subjected to rectification, obtaining TEF monomers from the tower top of the rectification tower; enabling tower kettle liquid of the rectification to enter a second separation tower. The TFE refining method has the beneficial effects that the first separation tower middle part side line production scheme is used; light ingredients are produced from the tower top of the first separation tower and enter a TFE recovery system for recovering TFE and then discharging light ingredients; middle part side line TFE coarse gas enters the rectification tower, and the TFE monomers with the purity being greater than 99.9999 percent can be obtained from the tower top of the rectification tower.