The invention discloses laser processing auxiliary equipment, and relates to an anti-collision positioning device for laser machining of a metal part. The anti-collision positioning device comprises amachining table, supporting columns are arranged at the four corners of the lower end face of the machining table correspondingly, mounting bases are arranged on the lower end faces of the supportingcolumns correspondingly, and fixing plates are arranged at the left side and the right side of the upper end face of the machining table correspondingly; T-shaped grooves are formed in the middles ofthe opposite faces of the fixing plates correspondingly, openings of the T-shaped grooves correspond to each other, a longitudinal transmission device is arranged in an inner cavity of the T-shaped groove in the left side and transversely sleeved with a transverse pipe, sliding devices are arranged at the left side and the right side of the transverse pipe correspondingly, and the right side of the transverse pipe is installed at the inner side of the T-shaped groove in the right side; and the left end face of an inner cavity of the transverse pipe is fixedly connected with a transverse servomotor, a motor shaft of the transverse servo motor is fixedly connected with a transverse threaded rod, and the outer wall of the right end of the transverse threaded rod is fixedly connected with atransverse fixing bearing. The anti-collision positioning device is simple in structure and convenient to operate, a laser head is effectively protected, and the service life of the laser head is prolonged.