The utility model provides a high-temperature high-pressure visual sand bed filtration instrument. The filtration instrument comprises a filtration cylinder, a pressure device and a heating device, wherein the filtration cylinder used for filling sand simulating the sand bed and drilling fluid of filtration experiments adopts a cylinder-shaped structure; a charging device is arranged at the upper end of the filtration cylinder; a valve used for discharging waste fluid is arranged at the lower part of the filtration cylinder; the pressure device comprises a press and a pressure air source; one end of the press used for evening the sand is connected with a compression bar arranged in the filtration cylinder in a sliding manner; the pressure air source is in on-off connection with two ends of the filtration cylinder; the heating device comprises a heater arranged in the filtration cylinder and a temperature controller; and the temperature controller is arranged outside the filtration cylinder and used for controlling movement of the heater. The filtration instrument adopting the filtration cylinder, the pressure device and the heating device can comprehensively simulate the pressure and the temperature during filed filtration, so that the experiment data is further approximate to reality, and the analysis and processing results have higher reference value.