A new type of heat-resistant borosilicate glass was designed based on waste TFT-LCD glass raw materials. Aiming at the difficulty in clarification of the heat-resistant glass, which leads to a large amount of bubbles in the glass, the effects of four clarifying agents: CeO2, NaCl, Na2SO4 and SnO2 on the clarification quality of the heat-resistant glass were studied by high temperature video research method of glass batch. The experiment observed the clarification process of glass melt through a high-temperature video system. The results show that at the melting temperature of 1 600 ℃, the best clarification effect is achieved when the addition amount of NaCl and Na2SO4 were added as a single clarifying agent at 0.50% (mass fraction) and 0.20% (mass fraction), respectively. The best clarification effect is achieved when the addition amount of clarifying agent combining CeO2 and SnO2 with NaNO3 is 0.40% (mass fraction) CeO2+2.60% (mass fraction) NaNO3 and 0.40% (mass fraction) SnO2+2.40% (mass fraction) NaNO3. The time for the glass melt foam to start falling back is 22, 10, 20 and 28 min, respectively. The initial falling temperatures are 1 110, 1 050, 1 103 and 1 143 ℃, respectively. Under the optimum holding time, the clarification effect is best with 0.50% (mass fraction) NaCl.