Composite material liquid forming device with fiber prestress

The invention discloses a composite material liquid forming device with fiber prestress. The composite material liquid forming device comprises a lower die, a clamp body and an upper die from bottom to top. An inner cavity is formed in the top surface of the lower die; a liquid polymer material sequentially flows through a feeding runner, a cavity and a discharging runner of the inner cavity from front to back; the clamp body is placed above the lower mold cavity and comprises a support, a fixed clamping part, a movable clamping part and a sliding part, the fixed clamping part is connected to the left side of the support, the movable clamping part is connected with the right side of the support through the sliding part, and the fiber cloth is fixed between the two clamping parts and bears prestress when the movable clamping part moves rightwards; the upper die is provided with a material inlet/outlet, a positioning hole and a connecting hole which are related; the device can realize liquid forming of a compos