Method for wrapping a load with a film by means of a wrapping machine provided with an unwinding apparatus comprising a reel of film, a couple of pre-stretching rollers (4, 5) for unwinding and stretching said film, at least one return roller arranged to divert said film toward said load and at least one force sensor associated with said return roller and arranged to measure a wrapping force of said film that is engaged with said return roller and wrapping around said load, said method comprising the following steps: - rotating said unwinding apparatus and said load relative to one another around a wrapping axis with a rotation speed (Ω) and unwinding said film from said reel by rotating said pre-stretching rollers (4, 5) in order to wrap said load with a series of bands of film (step 1); - measuring an effective wrapping force ( F m) of said film by means of said force sensor (step 2); - filtering said effective wrapping force ( F m) by means of a first filter with a first passband ( ΔF) that is a function of a set wrapping force ( F d) and an established maximum reading error (err) of said force sensor, so as to obtain a filtered wrapping force ( F mf) (step 3); - calculating by means of a PID control algorithm an instant film length ( L i) to be supplied per rotation of said unwinding apparatus or said load on the basis of said filtered wrapping force ( F mf) (step 4); - filtering said instant film length ( L i) by means of a second filter with a second passband ( ΔL) comprising a range of admissible values of said instant film length to be supplied (step 5); - calculating an instant rotation speed ( ω 1, ω 2) of at least one pre-stretching roller (4, 5) of said couple of pre-stretching rollers on the basis of said instant filtered film length ( L if) and at least of said rotation speed (Ω) (step 6); - rotating said at least one pre-stretching roller (4, 5) of said couple of pre-stretching rollers about one respective longitudinal axis with said instant rotation speed ( ω j, ω 2) (step 7). - rotating said unwinding apparatus and said load relative to one another around a wrapping axis with a rotation speed (Ω) and unwinding said film from said reel by rotating said pre-stretching rollers (4, 5) in order to wrap said load with a series of bands of film (step 1); - measuring an effective wrapping force ( F m) of said film by means of said force sensor (step 2); - filtering said effective wrapping force ( F m) by means of a first filter with a first passband ( ΔF) that is a function of a set wrapping force ( F d) and an established maximum reading error (err) of said force sensor, so as to obtain a filtered wrapping force ( F mf) (step 3); - calculating by means of a PID control algorithm an instant film length ( L i) to be supplied per rotation of said unwinding apparatus or said load on the basis of said filtered wrapping force ( F mf) (step 4); - filtering said instant film length ( L i) by means of a second filter with a second passband ( ΔL) comprising a range of admissible values of said instant film length to be supplied (step 5); - calculating an instant rotation speed ( ω 1, ω 2) of at least one pre-stretching roller (4, 5) of said couple of pre-stretching rollers on the basis of said instant filtered film length ( L if) and at least of said rotation speed (Ω) (step 6); - rotating said at least one pre-stretching roller (4, 5) of said couple of pre-stretching rollers about one respective longitudinal axis with said instant rotation speed ( ω j, ω 2) (step 7).