  This paper concerned with the effect of generalized uncertainty principle
(GUP) on the stochastic gravitational wave (SGW) background signal that
produced during first order cosmological QCD phase transition in early
universe. A modified formula of entropy is used to calculate the temporal
evolution of temperature of the universe as a function of the Hubble parameter.
The pressure that results from the recent lattice calculations, which provides
parameterizations of the pressure due to $u,~d,~s$ quarks and gluons, with
trace anomaly is used to describe the equation of state around QCD epoch. A
redshift in the peak frequency of SGW at current epoch is calculated. The
results indicate an increase in the frequency peak due to GUP effect, which
improves the ability to detect it. Taking into account bubble wall collisions
(BWC) and turbulent magnetohydrodynamics (MHD) as a source of SGW, a fractional
energy density is investigated. It is found that the GUP effect weakens the SGW
signal generated during QCD phase transition in comparison to its counterpart
in the absence of GUP. These results support understanding the cosmological QCD
phase transition and test the effectiveness of the GUP theory.
