The National Education Union (NEU) are concerned that SEND cuts are putting children at greater risk of exclusion.
They surveyed more than 900 teachers and other school staff in March and found that half are making cutbacks to the SEND support for pupils with the biggest rise in primary schools.
Also, primary schools are struggling to access external SEND support, with 40% reporting problems in bringing in outside expertise.
Dr Mary Bousted NEU general secretary said that "If the true measure of a country is how it treats its most vulnerable, then this government is failing big time. Children with special needs are being let down. The government's funding cuts are cutting so deep that schools cannot provide the support SEND pupils need and are struggling to access external support because this has been cut too.
The government needs to wake up to the facts and urgently make more money available for schools so they can keep SEND pupils safe and provide the help and support they need."