The utility model relates to a high temperature and high pressure safety joint, which is used for connection of downhole pipe columns of oil wells, water injection wells, and thermal recovery steam injection wells in oil production engineering. The utility model mainly solves a sand clamping problem of the pipe columns. The utility model is composed of an upper joint (1) which is provided with female buckles on both heads, a connecting short piece (2) which is provided with male buckles on both of the two heads and is connected with the upper head, and a lower joint (3) which is connected with the lower head of the connecting short piece and is provided with the female buckle on one head and is provided with the male buckle on the other head. The utility model can resist high temperature and high voltage; the structure is simple, and the volume is small. Disjunction of the upper and the lower joints not only can positively rotate and dislocate on a reverse opening, but also can be pulled off and dislocated. The utility model has the advantage of convenient and flexible usage.