Disclosed is mechanical equipment for manufacturing a T-shaped joint pile. A joint pile forming machine, an octagonal pile forming machine and a process of teamwork of the joint pile forming machine and the octagonal pile forming machine are included; a plurality of cemented soil octagonal piles are manufactured, and when cemented soil strength of the octagonal piles reaches a certain, a concrete joint pile is manufactured on each of the left portion, the right portion and the front portion of each octagonal pile through the joint pile forming machine according to the working manner of the joint pile forming machine; concave trapezoids of the concrete joint piles on the left portion, the right portion and the front portion of each cemented soil octagonal pile are matched with convex trapezoids of the concrete joint piles on the left portion, the right portion and the front portion of the corresponding cemented soil octagonal pile correspondingly; and accordingly, a plurality of T piles formed by combining the concrete joint piles and the cemented soil octagonal piles are formed and are used for reinforcing treatment of a weak foundation.