The invention discloses an automatic pipe laying device which is characterized in that the automatic pipe laying device comprises a positioning pipe laying device and a pipe hoisting device, the positioning pipe laying device comprises a positioning traveling crane, a device support, hydraulic pressure supporting legs and a rear-end positioning mechanism, the hydraulic pressure supporting legs are fixed on two sides of the device support, a rear-end positioning space is formed in the device support and used for covering a pipe body from top to bottom, the rear-end positioning mechanism comprises a rear-end left side pipe, a rear-end right side pipe and a rear-end middle side pipe which are rotatably mounted in the rear-end positioning space, a front-end positioning space is formed in the device support and used for carrying falling pipe bodies, guide plates are obliquely fixed on two sides of the front-end positioning space, a front-end positioning mechanism comprises a front-end left side pipe, a front-end right side pipe, a front-end pushing mechanism, a left side pipe driving mechanism and a right side pipe driving mechanism, the left side pipe driving mechanism is used for unfolding the front-end left side pipe, and the right side pipe driving mechanism is used for unfolding the front-end right side pipe. According to the automatic pipe laying device, rapid positioning can be achieved, abutting joint is convenient and rapid, opening efficiency is improved, and potential safety hazards are avoided.