The invention provides a horizontal anti-freezing strain clamp with a hydraulic combined dual-plate-type drainage plate. The strain clamp comprises a steel anchor, an aluminum pipe, a drainage plate assembly, a drainage clamp and an oil injecting hole, wherein the aluminum pipe is provided with the oil injecting hole; the steel anchor is connected with the aluminum pipe in a crimped manner; the steel anchor and the aluminum pipe are located in a same axial direction; the drainage plate assembly is connected with the aluminum pipe in a crimped manner; the drainage plate assembly is perpendicularly connected with the aluminum pipe; and the drainage clamp is connected with the drainage plate assembly through a bolt assembly. According to the strain clamp, a mature hydraulic connecting pipe is adopted and a crimping process is mature, so that the crimping quality is easy to guarantee; the problem in the fact that an assembling stringing strain clamp passes through a stringing device such as a pulley or the like is solved; the drainage plate is connected to the outer side of the aluminum pipe in a crimped manner, so that the area of contact between the drainage plate and the aluminum pipe of the strain clamp is ensured and the electric property of the strain clamp is guaranteed; and electric grease is injected between the aluminum pipe and aluminum cable steel reinforced, so that the strain clamp is endowed with anti-freezing capability and the service life of the strain clamp is prolonged.