The invention relates to a high temperature magnet of a nuclear magnetic resonance well logger, which can be applied to the technical field of the oil well logging. The high temperature magnet of the nuclear magnetic resonance well logger is characterized in that the high temperature magnet comprises a magnet and a magnet frame, wherein, the magnet is composed of two separating magnetic bodies, the two separating magnetic bodies are parallelly and symmetrically fixed at both sides of the magnet frame, and the N-pole directions of the two separating magnetic bodies are identical. Each separating magnetic body is formed through parallelly sticking seven magnetic blocks, and the polarized angle range of the seven magnetic blocks is between minus 15 degrees to 30 degrees. The magnet frame is made of titanium alloy material. The high temperature magnet of the nuclear magnetic resonance well logger can provide a relative uniform magnetic field area for a nuclear magnetic resonance well logger system, the volume size of the uniform magnetic field area can meet the requirements of the nuclear magnetic resonance logging, and the volume of the uniform magnetic field area is larger. In addition, the high temperature magnet is safe and stable under the conditions of 175 DEG C and 140 MPa.