Investment in the Egyptian agricultural sector is considered one of the basics for growth in the country, and the success of the agricultural development process is measured by the size of the investments that the sector attracts and their distribution among the various programs to achieve the highest possible efficiency. Despite the importance of the agricultural sector, it suffers from severe limitations in investments when compared to investments in other economic sectors, as the share of the agricultural sector in investments decreases from one year to the next. On the other hand, the distribution of investments within the agricultural sector is not commensurate with the importance of Therefore, this research mainly aimed at studying and analyzing the impact of policies on Egyptian agricultural investments during the period 2004-2018, which necessitated studying: (1) the development of public agricultural investments during the study periods, (2) the development of investments Private agricultural investments during the study periods, (3) the evolution of total agricultural investments during the study periods, (4) the study of the efficiency of agricultural investments. The research used the multiple regression method using dummy variables to estimate the agricultural investment functions during the period 2004 / 20015-2018 / 2019 and divide them to three periods, the period before the revolution, the revolution period, and the post-revolution period, in addition to calculating the efficiency of agricultural investment during those three periods. The research found many results, the most important is the efficient investment in the agricultural sector and the increase in the marginal productivity value of agricultural labor, which calls for more public investments directed to agriculture in order to expand agricultural production capacity to reduce the amount of imports and increaseagricultural exports.