Richard Smith, who works at MOTMax in Mansfield, said the Notts police officer could not find his sunglasses when he returned to pick up his car after testing.
It is claimed he then accused Mr Smith of stealing them and arrested him.
Mr Smith said he was held for about 40 minutes while another officer who was called to the scene searched MOTMax. The glasses were eventually found in the car.
Mr Smith, 45, said: "It was very humiliating.
"I told him that when I did the brake test I had to move an arm rest out of the way, and that there were a couple of pairs of sunglasses on it that may have fallen down.
"He just would not believe what I said. He came over straight away and arrested me."
Ah, the good old British bobby, eh? Admired and respected by all.