The invention relates to a static-pressure melting spinning apparatus. A core part of the apparatus is a static pressure apparatus, the static pressure apparatus mainly consists of a cylindrical airflow cylinder, a hollow cylindrical rectifier, an annular air guide plate, a circular-plate upper sealing plate, a hollow inverted circular truncated cone-shaped silking cylinder, a circular-plate lower sealing plate and an air pump; the upper sealing plate is embedded inside the air guide plate, the air guide plate is horizontally fixed inside the airflow cylinder, the rectifier is disposed between an upper bottom surface of the airflow cylinder and the upper sealing plate, the rectifier, the airflow cylinder and the air guide plate form an upper regulation and control cavity, a pressure controller is arranged in the upper regulation and control cavity, and the rectifier, the airflow cylinder and the upper sealing plate form an upper spinning passage; and the silking cylinder is fixed at the lower half portion of the airflow cylinder, and the air guide plate, the airflow cylinder and the silking cylinder form a lower regulation and control plate, and the upper sealing plate, the silking cylinder and the lower sealing plate form a lower spinning passage. The static-pressure melting spinning apparatus breaks through the problem of the traditional circumferentially-blowing and side-blowing cooling melting spinning technology at a constant humidity and temperature, can sufficiently and uniformly cool fibers and can be used for obviously improving the fiber quality.