The invention discloses a preparation method of a
piperacillin sodium and
tazobactam sodium freeze-dried preparation for injection. The preparation method comprises the following steps: S1, reacting; s2, pre-freezing: enabling the temperature of the product to reach-35 to-45 DEG C within 10-60 minutes, keeping the temperature for 1 hour, returning the temperature to-15 to-5 DEG C within 10-60 minutes, and keeping the temperature for 2 hours; cooling to-35 DEG C to-45 DEG C again for 10-60 minutes, and keeping for 2 hours; s3, sublimation
drying: vacuumizing to 0.15 Mbar, maintaining the vacuum degree, raising the temperature to 5-15 DEG C within 1-2 hours, and maintaining the temperature for 30 hours; s4, analyzing and
drying, keeping the vacuum at 0.15 Mbar, heating to 45-60 DEG C within 1-2 hours, keeping the temperature for 2 hours, vacuumizing to 0.01 Mbar, and keeping the temperature at 45-60 DEG C for 1 hour; and S5, testing
pressure rise, pressing a plug, and finishing freeze-
drying when the pressure rises to normal pressure. The problems that in the prior art, a
piperacillin sodium and
tazobactam sodium freeze-dried preparation for injection is high in
water content, so that the product stability is poor, and meanwhile, due to long freeze-
drying time, the preparation
energy consumption is high, and the product production cost is high are solved.