The invention discloses a sucking type grass mower. The absorbing type grass mower comprises a base plate and further comprises a sucking vacuum barrel, paddles, a motor and a collection bag, the sucking vacuum barrel is a cylindrical barrel body which is open downward and installed on the base plate with an opening facing downward and being attached to the ground, the two paddles are located at the top and the bottom of the sucking vacuum barrel respectively and connected through a shaft, the motor is installed at the top of the outer side o the sucking vacuum barrel and connected with the paddles in the sucking vacuum barrel and can drive the two paddles to rotate, a collection hole is formed in the side face of the sucking vacuum barrel, and the collection bag is connected to the collection hole. The sucking type grass mower has the advantages of being simple in structure, easy and convenient to operate, stable in work and capable of conducting grass mowing while collection, labor intensity is lowered, and the service life of equipment is long.