The invention discloses a construction garbage crushing device beneficial to environmental protection. The construction garbage crushing device comprises a crushing barrel, wherein a crushing barrel support is arranged at the bottom of the crushing barrel; universal wheels are arranged at the bottom of the crushing barrel support; a feed pipe is arranged at the left end of the top of the crushingbarrel; one end of the feed pipe is communicated with the crushing barrel; a feed hopper is arranged on the end part of the other end of the feed pipe; a water storage tank is arranged a the right endof the top of the crushing barrel; the water storage tank is communicated with a spray head; the spray head is fixedly arranged at the top end of the inner part of the crushing barrel, and a protective net is arranged on the outer side of the spray head; a motor is arranged at the rightly middle end of the top of the crushing barrel; an output shaft of the motor is fixedly connected with one endof a main shaft through a shaft coupler. Through arrangement of the spray head, dust collecting electrodes, a water purifying tank and sound absorbing cotton, the problems that the conventional garbage crushing device is poor in environment friendliness and incomplete in garbage crushing are solved.