Heat dissipation device of motor controller

The motor controller heat dissipation device comprises a water supply mechanism, the water supply mechanism comprises a box body, a water outlet and a water inlet are formed in the two opposite sides of the box body respectively, and a water supply unit connected with the water outlet is further arranged in the box body; a placing cavity for placing a controller is formed in the adjustable circulating water pipe network; the protective shell comprises two first protective shells and two second protective shells, the two first protective shells protect the two sets of circulating pipes and the first transverse telescopic water pipes correspondingly, and the two second protective shells protect the two sets of first vertical telescopic water pipes and the second transverse telescopic water pipes correspondingly; and the connecting and fixing mechanism is used for fixing the heat dissipation device at an installation position. The controller has the following advantages that cooling water in the water supply mec