The invention relates to a high pressure cable multifunctional constant temperature control case, comprising a base plate rack, an outer sleeve body arranged on the upper end of the base plate rack, a right sealing cap arranged on the right end of the outer sleeve body, a left end cap arranged on the left end of the outer sleeve body, a heating tube which is arranged on the lower part of the left end inside the outer sleeve body or on the lower part of the right end inside outer sleeve body, a bottom fixing V-shaped clamping block arranged on the base plate rack along an X direction and a clamping device arranged inside the outer sleeve body. The high pressure cable multifunctional constant temperature control case is compact in a structure, reasonable in design, simple in operation, low in cost, guarantees constancy of application of force and always keeps consistency of a clamping force.