The invention discloses a grouting circulation assembly suitable for a traveling block hook drilling machine. The grouting circulation assembly comprises a hoisting assembly, wherein the hoisting assembly comprises a lifting ring, two fixed plates and a grouting mechanism which are arranged from top to bottom in sequence, the two fixed plates are arranged on the lifting ring through a cross beam,the grouting mechanism is fixed on the two fixed plates through adapters and comprises a flow monitoring assembly, an insert sealing assembly and a piston type mud stop valve assembly, and two adjusting rods are symmetrically arranged on the two sides of the grouting mechanism; a flow detection nipple comprises a hollow pipe and multiple acoustic flowmeters, and the insert sealing assembly comprises a sealant barrel; the piston type mud stop valve assembly comprises a piston, a psiton spring and a piston sleeve which are sequentially arranged from inside to outside in a sleeving manner as wellas a pumping pressure type mud channel consisting of a valve core spring support, a valve core and a stop valve seat. The grouting circulation assembly has the characteristic of variable length, thepiston of the device can extend during grouting and extends into a casing pipe, the problem of mud spreading is effectively solved, grouting can be performed in the casing pipe lowering process, and casing pipe lowering and grouting are realized simultaneously.