High-temperature submersible motor protector

A high-temperature submersible motor protector belongs to the technical field of lifting of a high-temperature oil well. The protector comprises a shell, wherein a protector shaft is arranged in the shell, the lower end of the protector shaft is arranged in the shell by a plane bearing, and the upper end of the protector shaft is fixedly provided with a sand throwing device assembly; a protector head is arranged at the lower side of the sand throwing device assembly, a cavity at the upper side of the sand throwing device assembly is communicated with a mechanical sealing cavity through a well liquid through hole, and a safety valve is arranged on the protector head; a corrugated pipe assembly is arranged in the shell between the protector head and a shaft protection pipe assembly, and a sandwiched space formed between an inner pipe and an outer pipe of the corrugated pipe assembly is communicated with the mechanical sealing cavity through a breathing hole; a shaft protection pipe is arranged outside the protector shaft, a gap is reserved between the shaft protection pipe and the protector shaft, one end of the shaft protection pipe is connected with a first support body, the other end of the shaft protection pipe is matched with an inner hole of the protector head in a sliding way, and an oil through hole is arranged at the upper end of the shaft protection pipe; an oil injection valve is arranged on an intermediate body; and a tail seat of a second motor oil hole is arranged at the lower end of the shell, and a transportation cap is arranged at the lower end of the tail seat.