The invention discloses a concrete pump sound-absorbing cover which comprises a front end sound-absorbing section, a middle sound-absorbing section and a tail end sound-absorbing section connected in a telescopic embedding manner, wherein the adjacent tops of the front end sound-absorbing section, the middle sound-absorbing section and the tail end sound-absorbing section are connected with sliding rails matched with each other; each of the front end sound-absorbing section, the middle sound-absorbing section and the tail end sound-absorbing section comprises a cuboid frame; sound-absorbing layers are arranged on the top and two sides of each cuboid frame; the sound-absorbing layer is also arranged on the right side of the tail end sound-absorbing section; universal wheels are arranged on four corners of the bottom of each cuboid frame. The concrete pump sound-absorbing cover has the following benefits: the structure is simple, the application is convenient, the noise generated by a concrete pump is effectively reduced, the size of the concrete pump is met better, the application space is reduced, the folded structure is more convenient in case of turnover, the occupied space in case of storage is decreased, and a waterproof outer layer can protect the concrete pump in case of rain.