Rotary coder and engineering machine

The invention discloses a rotary coder which comprises a body, an input shaft, a magnet and a magnetic induction element. The input shaft is mounted on the body, one end of the input shaft is connected with the magnet, the magnetic induction element is mounted on the body, a south-north polar line of the magnet is perpendicular to the rotation center line of the input shaft, preset space is formed between the magnetic induction element and the magnet, and the magnetic induction element is used for inducing a rotation angle of the magnet. The invention further provides an engineering machine comprising the rotary coder. The rotary coder and the engineering machine have the advantages that problems of frangibility of a photoelectric code plate of the traditional photoelectric rotary coder and low measurement precision of the traditional photoelectric rotary coder are solved, vibration shock of the input shaft is reduced, the safety performance of the rotary coder is guaranteed, and the measurement precision of