Anti-seismic and anti-loosening modular speed reducer

The invention relates to the field of speed reducers, and discloses an anti-seismic and anti-loosening modular speed reducer which comprises an RV speed reducer body, the RV speed reducer body comprises a shell, an output shaft is rotationally connected to the inner wall of the shell, a crankshaft is installed in the center of the output shaft, an insertion hole is formed in the outer wall of the output shaft, and the outer wall of the insertion hole is provided with an anti-seismic and anti-loosening device. And one end of the RV speed reducer body is fixedly connected with a sealing cover. Through connection of a connecting insertion rod and an insertion hole, an output shaft drives a transmission rod to rotate to output power, limiting plates are used for limiting the two sides of a rotating connecting block, a pre-tightening bolt is rotated in advance to press a pressing plate, and the pressing plate is used for compressing a second spring; a certain preloading force is applied to the connecting block in