A clamping device for electromechanical equipment machining comprises a base, an adjusting bolt, a pair of clamping blocks and a U-shaped base, the adjusting bolt penetrates through the bottom of thebase and is connected with the base through a bolt, and the end of the adjusting bolt is arranged above the base. The pair of clamping blocks are arranged at the two sides of the adjusting bolt respectively, a sliding groove is formed in the base, and a sliding block is arranged at the bottom of each clamping block; the clamping blocks are connected with the base in a sliding mode through the sliding blocks and the sliding grooves respectively, the U-shaped seat is arranged above the pair of clamping blocks, and the pair of clamping blocks are arranged in the U-shaped seat; the two side wallsof the U-shaped seat are in threaded connection with the clamping bolts respectively, and the ends of the clamping bolts abut against the outer side walls of the corresponding clamping blocks. The clamping device is simple and reasonable in structure, ingenious in design and novel in conception, is easy to produce and manufacture and is capable of effectively fastening a workpiece, a machined object does not break, and the economic losses are avoided.