The invention provides an exposure machine and relates to the technical field of exposure. The exposure machine realizes alignment of a mask plate and a display substrate along a plurality of directions and reduces an exposure machine production cost. The exposure machine comprises two detection systems. The plane where the detection systems are arranged is parallel to the plane where the mask plate is arranged and is higher than the plane where the mask plate is arranged. The two detection systems are parallel to and corresponding to the opposite first and second sides of the mask plate. The exposure machine further comprises a driving module, a driving wheel and a driven wheel connected to the driving wheel by a crawler belt. The two detection systems are fixedly installed on the end surface of the driven wheel. The driving wheel is connected to the driving module. The driving module drives the driving wheel to rotate. The driving wheel drives the driven wheel to rotate. The driven wheel drives the two detection systems to rotate by a first angle on the plane where the detection systems are arranged. The first angle is any angle greater than 0. The exposure machine is used for display substrate exposure.