Static stretching device

The utility model relates to a static stretching device which comprises one or more testing units, each testing unit comprises a rack, a guide rail arranged on the rack, a first clamping assembly, a second clamping assembly, a driving part and a transmission assembly, and the first clamping assembly and the second clamping assembly are oppositely arranged. Each of the first clamping assembly and the second clamping assembly comprises a fixing plate and a clamping piece, the fixing plates are connected with the transmission assembly, the clamping pieces are arranged on the fixing plates, the clamping piece of the first clamping assembly is used for clamping one end of a to-be-tested sample, and the clamping piece of the second clamping assembly is used for clamping the other end of the to-be-tested sample; the driving component is in transmission connection with the transmission assembly and used for driving the first clamping assembly and the second clamping assembly to move in the direction away from or clos